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15+2x=5x-6
We move all terms to the left:
15+2x-(5x-6)=0
We get rid of parentheses
2x-5x+6+15=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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