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15x-40=3x-64
We move all terms to the left:
15x-40-(3x-64)=0
We get rid of parentheses
15x-3x+64-40=0
We add all the numbers together, and all the variables
12x+24=0
We move all terms containing x to the left, all other terms to the right
12x=-24
x=-24/12
x=-2
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