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91=4x+15
We move all terms to the left:
91-(4x+15)=0
We get rid of parentheses
-4x-15+91=0
We add all the numbers together, and all the variables
-4x+76=0
We move all terms containing x to the left, all other terms to the right
-4x=-76
x=-76/-4
x=+19
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