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21=-7(2x+7)
We move all terms to the left:
21-(-7(2x+7))=0
We calculate terms in parentheses: -(-7(2x+7)), so:We get rid of parentheses
-7(2x+7)
We multiply parentheses
-14x-49
Back to the equation:
-(-14x-49)
14x+49+21=0
We add all the numbers together, and all the variables
14x+70=0
We move all terms containing x to the left, all other terms to the right
14x=-70
x=-70/14
x=-5
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