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128-3x=15x-8
We move all terms to the left:
128-3x-(15x-8)=0
We get rid of parentheses
-3x-15x+8+128=0
We add all the numbers together, and all the variables
-18x+136=0
We move all terms containing x to the left, all other terms to the right
-18x=-136
x=-136/-18
x=7+5/9
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