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18=5x+2(x-5)
We move all terms to the left:
18-(5x+2(x-5))=0
We calculate terms in parentheses: -(5x+2(x-5)), so:We get rid of parentheses
5x+2(x-5)
We multiply parentheses
5x+2x-10
We add all the numbers together, and all the variables
7x-10
Back to the equation:
-(7x-10)
-7x+10+18=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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