21x=5(4x-3)

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Solution for 21x=5(4x-3) equation: 



21x=5(4x-3)

We move all terms to the left:

21x-(5(4x-3))=0



We calculate terms in parentheses: -(5(4x-3)), so:

5(4x-3)

We multiply parentheses

20x-15

Back to the equation:

-(20x-15)



We get rid of parentheses

21x-20x+15=0

We add all the numbers together, and all the variables

x+15=0

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

x=-15

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