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8+15x=128-5x
We move all terms to the left:
8+15x-(128-5x)=0
We add all the numbers together, and all the variables
15x-(-5x+128)+8=0
We get rid of parentheses
15x+5x-128+8=0
We add all the numbers together, and all the variables
20x-120=0
We move all terms containing x to the left, all other terms to the right
20x=120
x=120/20
x=6
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