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51=3(7x-2)+3(x-5)
We move all terms to the left:
51-(3(7x-2)+3(x-5))=0
We calculate terms in parentheses: -(3(7x-2)+3(x-5)), so:We get rid of parentheses
3(7x-2)+3(x-5)
We multiply parentheses
21x+3x-6-15
We add all the numbers together, and all the variables
24x-21
Back to the equation:
-(24x-21)
-24x+21+51=0
We add all the numbers together, and all the variables
-24x+72=0
We move all terms containing x to the left, all other terms to the right
-24x=-72
x=-72/-24
x=+3
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