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6x+7=-8x-13
We move all terms to the left:
6x+7-(-8x-13)=0
We get rid of parentheses
6x+8x+13+7=0
We add all the numbers together, and all the variables
14x+20=0
We move all terms containing x to the left, all other terms to the right
14x=-20
x=-20/14
x=-1+3/7
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