thats an example question... whats X?
2007-07-23 04:59:28 · 7 answers · asked by @_@ 4 in Science & Mathematics ➔ Mathematics
2x - 5 = -4x + 7
add 4x to both sides
2x + 4x - 5 = -4x + 4x + 7
simplify
6x - 5 = 7
add 5 to both sides
6x - 5 + 5 = 7 + 5
simplify
6x = 12
divide both sides by 6
6x/6 = 12/6
simplify
x = 2
2007-07-23 05:02:14 · answer #1 · answered by jonmm 4 · 0⤊ 0⤋
X=2
2007-07-23 05:03:19 · answer #2 · answered by cars1977 2 · 0⤊ 0⤋
A. Move all X to the same side of equation, to do that do the same oppositive mathematical operation at both sides of equation. (Example add 4x to each side).
2x - 5 = -4X + 7
2x - 5 + 4x = -4x + 7 + 4x
6x - 5 = 7
B. Move all contants to the opposite side (Example add 5 to each side).
6x - 5 + 5 = 7 + 5
6x = 12
C. Let the x alone! Since the x is multiplied by a constant, divide for that constant at both side of equation..
6x / 6 = 12 / 6
x = 2
2007-07-23 05:09:57 · answer #3 · answered by Darth Eugene Vader 7 · 0⤊ 0⤋
2x - 5 = -4x + 7
2x - -4x = 7 - -5 (2x +4x = 7 +5)
so 6x = 12
because the sign changes when you move it to the other side of the equals sign
therefore, x = 2
2007-07-23 05:04:01 · answer #4 · answered by dan 4 · 0⤊ 0⤋
2x + 4x = 7 + 5
6x = 12
x = 2
2007-07-23 05:07:47 · answer #5 · answered by Como 7 · 0⤊ 0⤋
2x - 5 = -4x + 7
6x - 5 = 7
6x = 12
x = 2
2007-07-23 05:03:31 · answer #6 · answered by C squared 2 · 0⤊ 0⤋
x=2
2x=-4x+12
6x=12
x=2
2007-07-23 05:03:14 · answer #7 · answered by this is only a test 2 · 0⤊ 0⤋