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6x+54=-5x-111
We move all terms to the left:
6x+54-(-5x-111)=0
We get rid of parentheses
6x+5x+111+54=0
We add all the numbers together, and all the variables
11x+165=0
We move all terms containing x to the left, all other terms to the right
11x=-165
x=-165/11
x=-15
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