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115=40+15x
We move all terms to the left:
115-(40+15x)=0
We add all the numbers together, and all the variables
-(15x+40)+115=0
We get rid of parentheses
-15x-40+115=0
We add all the numbers together, and all the variables
-15x+75=0
We move all terms containing x to the left, all other terms to the right
-15x=-75
x=-75/-15
x=+5
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