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21=(x/3)+7
We move all terms to the left:
21-((x/3)+7)=0
We add all the numbers together, and all the variables
-((+x/3)+7)+21=0
We multiply all the terms by the denominator
-((+x+21*3)+7)=0
We calculate terms in parentheses: -((+x+21*3)+7), so:We get rid of parentheses
(+x+21*3)+7
We add all the numbers together, and all the variables
(x+63)+7
We get rid of parentheses
x+63+7
We add all the numbers together, and all the variables
x+70
Back to the equation:
-(x+70)
-x-70=0
We add all the numbers together, and all the variables
-1x-70=0
We move all terms containing x to the left, all other terms to the right
-x=70
x=70/-1
x=-70
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