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91=7(-3x+1)
We move all terms to the left:
91-(7(-3x+1))=0
We calculate terms in parentheses: -(7(-3x+1)), so:We get rid of parentheses
7(-3x+1)
We multiply parentheses
-21x+7
Back to the equation:
-(-21x+7)
21x-7+91=0
We add all the numbers together, and all the variables
21x+84=0
We move all terms containing x to the left, all other terms to the right
21x=-84
x=-84/21
x=-4
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