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15=-4x-8
We move all terms to the left:
15-(-4x-8)=0
We get rid of parentheses
4x+8+15=0
We add all the numbers together, and all the variables
4x+23=0
We move all terms containing x to the left, all other terms to the right
4x=-23
x=-23/4
x=-5+3/4
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