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-40=23-8x+15x
We move all terms to the left:
-40-(23-8x+15x)=0
We add all the numbers together, and all the variables
-(7x+23)-40=0
We get rid of parentheses
-7x-23-40=0
We add all the numbers together, and all the variables
-7x-63=0
We move all terms containing x to the left, all other terms to the right
-7x=63
x=63/-7
x=-9
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