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7x+21x-4=7(4x+3)
We move all terms to the left:
7x+21x-4-(7(4x+3))=0
We add all the numbers together, and all the variables
28x-(7(4x+3))-4=0
We calculate terms in parentheses: -(7(4x+3)), so:We get rid of parentheses
7(4x+3)
We multiply parentheses
28x+21
Back to the equation:
-(28x+21)
28x-28x-21-4=0
We add all the numbers together, and all the variables
-25!=0
There is no solution for this equation
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