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4x+15=-3x-19
We move all terms to the left:
4x+15-(-3x-19)=0
We get rid of parentheses
4x+3x+19+15=0
We add all the numbers together, and all the variables
7x+34=0
We move all terms containing x to the left, all other terms to the right
7x=-34
x=-34/7
x=-4+6/7
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