(4a+28)/21=(a+7)/5

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Solution for (4a+28)/21=(a+7)/5 equation: 



(4a+28)/21=(a+7)/5

We move all terms to the left:

(4a+28)/21-((a+7)/5)=0

We calculate fractions


4a/()+(-((a+7)*21)/()=0



We calculate terms in parentheses: +(-((a+7)*21)/(), so:

-((a+7)*21)/(

We multiply all the terms by the denominator


-((a+7)*21)



We calculate terms in parentheses: -((a+7)*21), so:

(a+7)*21

We multiply parentheses

21a+147

Back to the equation:

-(21a+147)



We get rid of parentheses

-21a-147

Back to the equation:

+(-21a-147)



We get rid of parentheses

4a/()-21a-147=0

We multiply all the terms by the denominator


4a-21a*()-147*()=0

We add all the numbers together, and all the variables

4a-21a*()=0

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