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-20-6x=-4(x+7)
We move all terms to the left:
-20-6x-(-4(x+7))=0
We calculate terms in parentheses: -(-4(x+7)), so:We get rid of parentheses
-4(x+7)
We multiply parentheses
-4x-28
Back to the equation:
-(-4x-28)
-6x+4x+28-20=0
We add all the numbers together, and all the variables
-2x+8=0
We move all terms containing x to the left, all other terms to the right
-2x=-8
x=-8/-2
x=+4
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