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2x-42=2(5x+3)
We move all terms to the left:
2x-42-(2(5x+3))=0
We calculate terms in parentheses: -(2(5x+3)), so:We get rid of parentheses
2(5x+3)
We multiply parentheses
10x+6
Back to the equation:
-(10x+6)
2x-10x-6-42=0
We add all the numbers together, and all the variables
-8x-48=0
We move all terms containing x to the left, all other terms to the right
-8x=48
x=48/-8
x=-6
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