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(10x+21)+(13x+1)=90
We move all terms to the left:
(10x+21)+(13x+1)-(90)=0
We get rid of parentheses
10x+13x+21+1-90=0
We add all the numbers together, and all the variables
23x-68=0
We move all terms containing x to the left, all other terms to the right
23x=68
x=68/23
x=2+22/23
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