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