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15+8x=2x+3
We move all terms to the left:
15+8x-(2x+3)=0
We get rid of parentheses
8x-2x-3+15=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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