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10x+15=-4x-13
We move all terms to the left:
10x+15-(-4x-13)=0
We get rid of parentheses
10x+4x+13+15=0
We add all the numbers together, and all the variables
14x+28=0
We move all terms containing x to the left, all other terms to the right
14x=-28
x=-28/14
x=-2
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