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8x+13=-7x-20
We move all terms to the left:
8x+13-(-7x-20)=0
We get rid of parentheses
8x+7x+20+13=0
We add all the numbers together, and all the variables
15x+33=0
We move all terms containing x to the left, all other terms to the right
15x=-33
x=-33/15
x=-2+1/5
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