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-28=-7(3x-+4)+21x
We move all terms to the left:
-28-(-7(3x-+4)+21x)=0
We add all the numbers together, and all the variables
-(-7(+3x)+21x)-28=0
We calculate terms in parentheses: -(-7(+3x)+21x), so:We add all the numbers together, and all the variables
-7(+3x)+21x
We add all the numbers together, and all the variables
21x-7(+3x)
We multiply parentheses
21x-21x
We add all the numbers together, and all the variables
Back to the equation:
-()
=0
x=0/1
x=0
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