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6x+(x+13)=90
We move all terms to the left:
6x+(x+13)-(90)=0
We get rid of parentheses
6x+x+13-90=0
We add all the numbers together, and all the variables
7x-77=0
We move all terms containing x to the left, all other terms to the right
7x=77
x=77/7
x=11
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