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20(13+x)=910
We move all terms to the left:
20(13+x)-(910)=0
We add all the numbers together, and all the variables
20(x+13)-910=0
We multiply parentheses
20x+260-910=0
We add all the numbers together, and all the variables
20x-650=0
We move all terms containing x to the left, all other terms to the right
20x=650
x=650/20
x=32+1/2
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