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20x=-5(2x-6)
We move all terms to the left:
20x-(-5(2x-6))=0
We calculate terms in parentheses: -(-5(2x-6)), so:We get rid of parentheses
-5(2x-6)
We multiply parentheses
-10x+30
Back to the equation:
-(-10x+30)
20x+10x-30=0
We add all the numbers together, and all the variables
30x-30=0
We move all terms containing x to the left, all other terms to the right
30x=30
x=30/30
x=1
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