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21(2+x)=14(7-x)
We move all terms to the left:
21(2+x)-(14(7-x))=0
We add all the numbers together, and all the variables
21(x+2)-(14(-1x+7))=0
We multiply parentheses
21x-(14(-1x+7))+42=0
We calculate terms in parentheses: -(14(-1x+7)), so:We get rid of parentheses
14(-1x+7)
We multiply parentheses
-14x+98
Back to the equation:
-(-14x+98)
21x+14x-98+42=0
We add all the numbers together, and all the variables
35x-56=0
We move all terms containing x to the left, all other terms to the right
35x=56
x=56/35
x=1+3/5
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