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5x+3+4x=-7x-13
We move all terms to the left:
5x+3+4x-(-7x-13)=0
We add all the numbers together, and all the variables
9x-(-7x-13)+3=0
We get rid of parentheses
9x+7x+13+3=0
We add all the numbers together, and all the variables
16x+16=0
We move all terms containing x to the left, all other terms to the right
16x=-16
x=-16/16
x=-1
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