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15=-5(x+4)
We move all terms to the left:
15-(-5(x+4))=0
We calculate terms in parentheses: -(-5(x+4)), so:We get rid of parentheses
-5(x+4)
We multiply parentheses
-5x-20
Back to the equation:
-(-5x-20)
5x+20+15=0
We add all the numbers together, and all the variables
5x+35=0
We move all terms containing x to the left, all other terms to the right
5x=-35
x=-35/5
x=-7
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