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91=3x+13
We move all terms to the left:
91-(3x+13)=0
We get rid of parentheses
-3x-13+91=0
We add all the numbers together, and all the variables
-3x+78=0
We move all terms containing x to the left, all other terms to the right
-3x=-78
x=-78/-3
x=+26
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