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13x-9x+20=3(x+10)
We move all terms to the left:
13x-9x+20-(3(x+10))=0
We add all the numbers together, and all the variables
4x-(3(x+10))+20=0
We calculate terms in parentheses: -(3(x+10)), so:We get rid of parentheses
3(x+10)
We multiply parentheses
3x+30
Back to the equation:
-(3x+30)
4x-3x-30+20=0
We add all the numbers together, and all the variables
x-10=0
We move all terms containing x to the left, all other terms to the right
x=10
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