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(7x+1)+(13x+11)=90
We move all terms to the left:
(7x+1)+(13x+11)-(90)=0
We get rid of parentheses
7x+13x+1+11-90=0
We add all the numbers together, and all the variables
20x-78=0
We move all terms containing x to the left, all other terms to the right
20x=78
x=78/20
x=3+9/10
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