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91=4x+3x+7
We move all terms to the left:
91-(4x+3x+7)=0
We add all the numbers together, and all the variables
-(7x+7)+91=0
We get rid of parentheses
-7x-7+91=0
We add all the numbers together, and all the variables
-7x+84=0
We move all terms containing x to the left, all other terms to the right
-7x=-84
x=-84/-7
x=+12
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