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