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7x+13=-2x-28
We move all terms to the left:
7x+13-(-2x-28)=0
We get rid of parentheses
7x+2x+28+13=0
We add all the numbers together, and all the variables
9x+41=0
We move all terms containing x to the left, all other terms to the right
9x=-41
x=-41/9
x=-4+5/9
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