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4x+15=-11x
We move all terms to the left:
4x+15-(-11x)=0
We get rid of parentheses
4x+11x+15=0
We add all the numbers together, and all the variables
15x+15=0
We move all terms containing x to the left, all other terms to the right
15x=-15
x=-15/15
x=-1
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