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7x-3=13(x-3)
We move all terms to the left:
7x-3-(13(x-3))=0
We calculate terms in parentheses: -(13(x-3)), so:We get rid of parentheses
13(x-3)
We multiply parentheses
13x-39
Back to the equation:
-(13x-39)
7x-13x+39-3=0
We add all the numbers together, and all the variables
-6x+36=0
We move all terms containing x to the left, all other terms to the right
-6x=-36
x=-36/-6
x=+6
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