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73=7x+5(x-7)
We move all terms to the left:
73-(7x+5(x-7))=0
We calculate terms in parentheses: -(7x+5(x-7)), so:We get rid of parentheses
7x+5(x-7)
We multiply parentheses
7x+5x-35
We add all the numbers together, and all the variables
12x-35
Back to the equation:
-(12x-35)
-12x+35+73=0
We add all the numbers together, and all the variables
-12x+108=0
We move all terms containing x to the left, all other terms to the right
-12x=-108
x=-108/-12
x=+9
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