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28=7(3x+4)+21x
We move all terms to the left:
28-(7(3x+4)+21x)=0
We calculate terms in parentheses: -(7(3x+4)+21x), so:We get rid of parentheses
7(3x+4)+21x
We add all the numbers together, and all the variables
21x+7(3x+4)
We multiply parentheses
21x+21x+28
We add all the numbers together, and all the variables
42x+28
Back to the equation:
-(42x+28)
-42x-28+28=0
We add all the numbers together, and all the variables
-42x=0
x=0/-42
x=0
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