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55=5(2x+5)
We move all terms to the left:
55-(5(2x+5))=0
We calculate terms in parentheses: -(5(2x+5)), so:We get rid of parentheses
5(2x+5)
We multiply parentheses
10x+25
Back to the equation:
-(10x+25)
-10x-25+55=0
We add all the numbers together, and all the variables
-10x+30=0
We move all terms containing x to the left, all other terms to the right
-10x=-30
x=-30/-10
x=+3
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