3/7(-28a+21)=129

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Solution for 3/7(-28a+21)=129 equation: 



3/7(-28a+21)=129

We move all terms to the left:

3/7(-28a+21)-(129)=0



Domain of the equation: 7(-28a+21)!=0

a∈R



We multiply all the terms by the denominator


-129*7(-28a+21)+3=0

Wy multiply elements

-903a(-+3=0

We use the square of the difference formula

-903a(-3=0

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