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5x+7x-4=3(4x+9)
We move all terms to the left:
5x+7x-4-(3(4x+9))=0
We add all the numbers together, and all the variables
12x-(3(4x+9))-4=0
We calculate terms in parentheses: -(3(4x+9)), so:We get rid of parentheses
3(4x+9)
We multiply parentheses
12x+27
Back to the equation:
-(12x+27)
12x-12x-27-4=0
We add all the numbers together, and all the variables
-31!=0
There is no solution for this equation
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