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-8x-138=100-15x
We move all terms to the left:
-8x-138-(100-15x)=0
We add all the numbers together, and all the variables
-8x-(-15x+100)-138=0
We get rid of parentheses
-8x+15x-100-138=0
We add all the numbers together, and all the variables
7x-238=0
We move all terms containing x to the left, all other terms to the right
7x=238
x=238/7
x=34
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