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128=8+15x
We move all terms to the left:
128-(8+15x)=0
We add all the numbers together, and all the variables
-(15x+8)+128=0
We get rid of parentheses
-15x-8+128=0
We add all the numbers together, and all the variables
-15x+120=0
We move all terms containing x to the left, all other terms to the right
-15x=-120
x=-120/-15
x=+8
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