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2x+13=-4x-13
We move all terms to the left:
2x+13-(-4x-13)=0
We get rid of parentheses
2x+4x+13+13=0
We add all the numbers together, and all the variables
6x+26=0
We move all terms containing x to the left, all other terms to the right
6x=-26
x=-26/6
x=-4+1/3
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