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-113-2x=90-9x
We move all terms to the left:
-113-2x-(90-9x)=0
We add all the numbers together, and all the variables
-2x-(-9x+90)-113=0
We get rid of parentheses
-2x+9x-90-113=0
We add all the numbers together, and all the variables
7x-203=0
We move all terms containing x to the left, all other terms to the right
7x=203
x=203/7
x=29
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