9(9-2x)=2(9-2x)+21

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Solution for 9(9-2x)=2(9-2x)+21 equation: 



9(9-2x)=2(9-2x)+21

We move all terms to the left:

9(9-2x)-(2(9-2x)+21)=0

We add all the numbers together, and all the variables

9(-2x+9)-(2(-2x+9)+21)=0

We multiply parentheses

-18x-(2(-2x+9)+21)+81=0



We calculate terms in parentheses: -(2(-2x+9)+21), so:

2(-2x+9)+21

We multiply parentheses

-4x+18+21

We add all the numbers together, and all the variables

-4x+39

Back to the equation:

-(-4x+39)



We get rid of parentheses

-18x+4x-39+81=0

We add all the numbers together, and all the variables

-14x+42=0

We move all terms containing x to the left, all other terms to the right

-14x=-42

x=-42/-14

x=+3

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