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-5x-20=-9(x+4)
We move all terms to the left:
-5x-20-(-9(x+4))=0
We calculate terms in parentheses: -(-9(x+4)), so:We get rid of parentheses
-9(x+4)
We multiply parentheses
-9x-36
Back to the equation:
-(-9x-36)
-5x+9x+36-20=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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