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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