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55=2.5(3x+10)
We move all terms to the left:
55-(2.5(3x+10))=0
We calculate terms in parentheses: -(2.5(3x+10)), so:We get rid of parentheses
2.5(3x+10)
We multiply parentheses
7.5x+25
Back to the equation:
-(7.5x+25)
-7.5x-25+55=0
We add all the numbers together, and all the variables
-7.5x+30=0
We move all terms containing x to the left, all other terms to the right
-7.5x=-30
x=-30/-7.5
x=+4
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