3x(14-x)=x(21-3x)

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Solution for 3x(14-x)=x(21-3x) equation: 



3x(14-x)=x(21-3x)

We move all terms to the left:

3x(14-x)-(x(21-3x))=0

We add all the numbers together, and all the variables

3x(-1x+14)-(x(-3x+21))=0

We multiply parentheses

-3x^2+42x-(x(-3x+21))=0



We calculate terms in parentheses: -(x(-3x+21)), so:

x(-3x+21)

We multiply parentheses

-3x^2+21x

Back to the equation:

-(-3x^2+21x)



We get rid of parentheses

-3x^2+3x^2-21x+42x=0

We add all the numbers together, and all the variables

21x=0

x=0/21

x=0

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