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15(x-1)=20(x-10)
We move all terms to the left:
15(x-1)-(20(x-10))=0
We multiply parentheses
15x-(20(x-10))-15=0
We calculate terms in parentheses: -(20(x-10)), so:We get rid of parentheses
20(x-10)
We multiply parentheses
20x-200
Back to the equation:
-(20x-200)
15x-20x+200-15=0
We add all the numbers together, and all the variables
-5x+185=0
We move all terms containing x to the left, all other terms to the right
-5x=-185
x=-185/-5
x=+37
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