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11x+15=-2x
We move all terms to the left:
11x+15-(-2x)=0
We get rid of parentheses
11x+2x+15=0
We add all the numbers together, and all the variables
13x+15=0
We move all terms containing x to the left, all other terms to the right
13x=-15
x=-15/13
x=-1+2/13
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