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8(x-10)=9(x-10)
We move all terms to the left:
8(x-10)-(9(x-10))=0
We multiply parentheses
8x-(9(x-10))-80=0
We calculate terms in parentheses: -(9(x-10)), so:We get rid of parentheses
9(x-10)
We multiply parentheses
9x-90
Back to the equation:
-(9x-90)
8x-9x+90-80=0
We add all the numbers together, and all the variables
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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