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(10x+13)+(8x+2)=90
We move all terms to the left:
(10x+13)+(8x+2)-(90)=0
We get rid of parentheses
10x+8x+13+2-90=0
We add all the numbers together, and all the variables
18x-75=0
We move all terms containing x to the left, all other terms to the right
18x=75
x=75/18
x=4+1/6
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