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(50+4x)*x=50x+4x^2
We move all terms to the left:
(50+4x)*x-(50x+4x^2)=0
We add all the numbers together, and all the variables
-(50x+4x^2)+(4x+50)*x=0
We multiply parentheses
-(50x+4x^2)+4x^2+50x=0
We get rid of parentheses
-4x^2+4x^2-50x+50x=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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