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