2007-09-17 05:29:15 · 8 answers · asked by Corey B 1 in Science & Mathematics ➔ Mathematics
Assuming this is (21 * 7) + 9 = 3 - x, then:
(21 * 7) + 9 = 3 - x.
147 + 9 = 3 - x.
156 = 3 - x.
153 = -x.
x = -153.
2007-09-17 05:33:48 · answer #1 · answered by RustyL71 4 · 1⤊ 0⤋
Order of Operations: Parenthesis, Exponents, Multiply/ Divide, Addition, Subtraction. You can also say "Please Excuse My Dear Aunt Sally" if it helps you remember.
First you multiply 21(7) which is 147 then you add 9 which is 156 so:
156=3 - x
subtract 3 from both sides
153 = - x
divide by -1
-153 = x
2007-09-17 12:37:19 · answer #2 · answered by Lollipop 5 · 0⤊ 0⤋
start on the side with no variables
21*7=147
147+9=156
then start to get X by itself
156-3=153
153*-1=-153
x=153
2007-09-17 12:38:03 · answer #3 · answered by britbutt 3 · 0⤊ 0⤋
147 + 9 = 3 - x
156 = 3 - x
x = 3 - 156
x = - 153
2007-09-19 13:47:43 · answer #4 · answered by Como 7 · 1⤊ 0⤋
147 + 9 = 3 - x
156=3 - x
-3 - 3
________
153 = -x
153/-x -x/-x
x=-153
2007-09-17 12:35:16 · answer #5 · answered by kari_girl84 3 · 0⤊ 0⤋
147+9=3-x
156=3-x
156-3=3-3-x
153=-x
x=-153
2007-09-17 12:42:48 · answer #6 · answered by Jeremy 3 · 0⤊ 1⤋
x=-153
2007-09-17 12:35:02 · answer #7 · answered by msg_me 2 · 0⤊ 0⤋
-153
2007-09-17 12:37:27 · answer #8 · answered by Anonymous · 0⤊ 0⤋