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4x+13=-3(x+5)
We move all terms to the left:
4x+13-(-3(x+5))=0
We calculate terms in parentheses: -(-3(x+5)), so:We get rid of parentheses
-3(x+5)
We multiply parentheses
-3x-15
Back to the equation:
-(-3x-15)
4x+3x+15+13=0
We add all the numbers together, and all the variables
7x+28=0
We move all terms containing x to the left, all other terms to the right
7x=-28
x=-28/7
x=-4
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