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2(x.+7)=4(x-7)
We move all terms to the left:
2(x.+7)-(4(x-7))=0
We multiply parentheses
2x-(4(x-7))+14=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)
2x-4x+28+14=0
We add all the numbers together, and all the variables
-2x+42=0
We move all terms containing x to the left, all other terms to the right
-2x=-42
x=-42/-2
x=+21
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