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-7(x-3)=-5(x-3)
We move all terms to the left:
-7(x-3)-(-5(x-3))=0
We multiply parentheses
-7x-(-5(x-3))+21=0
We calculate terms in parentheses: -(-5(x-3)), so:We get rid of parentheses
-5(x-3)
We multiply parentheses
-5x+15
Back to the equation:
-(-5x+15)
-7x+5x-15+21=0
We add all the numbers together, and all the variables
-2x+6=0
We move all terms containing x to the left, all other terms to the right
-2x=-6
x=-6/-2
x=+3
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