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15x+31=9x-11
We move all terms to the left:
15x+31-(9x-11)=0
We get rid of parentheses
15x-9x+11+31=0
We add all the numbers together, and all the variables
6x+42=0
We move all terms containing x to the left, all other terms to the right
6x=-42
x=-42/6
x=-7
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