1/3(21-9x)=7-3x

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Solution for 1/3(21-9x)=7-3x equation: 



1/3(21-9x)=7-3x

We move all terms to the left:

1/3(21-9x)-(7-3x)=0



Domain of the equation: 3(21-9x)!=0

x∈R



We add all the numbers together, and all the variables

1/3(-9x+21)-(-3x+7)=0

We get rid of parentheses

1/3(-9x+21)+3x-7=0

We multiply all the terms by the denominator


3x*3(-9x+21)-7*3(-9x+21)+1=0

Wy multiply elements

9x^2(--21x(-+1=0

We use the square of the difference formula

9x^2(+21x(-1=0

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