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13x+5=2(9x+10)
We move all terms to the left:
13x+5-(2(9x+10))=0
We calculate terms in parentheses: -(2(9x+10)), so:We get rid of parentheses
2(9x+10)
We multiply parentheses
18x+20
Back to the equation:
-(18x+20)
13x-18x-20+5=0
We add all the numbers together, and all the variables
-5x-15=0
We move all terms containing x to the left, all other terms to the right
-5x=15
x=15/-5
x=-3
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