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40-(18+x)=7*15-70
We move all terms to the left:
40-(18+x)-(7*15-70)=0
We add all the numbers together, and all the variables
-(x+18)+40-35=0
We add all the numbers together, and all the variables
-(x+18)+5=0
We get rid of parentheses
-x-18+5=0
We add all the numbers together, and all the variables
-1x-13=0
We move all terms containing x to the left, all other terms to the right
-x=13
x=13/-1
x=-13
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