21x=3(5+2x)

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Solution for 21x=3(5+2x) equation: 



21x=3(5+2x)

We move all terms to the left:

21x-(3(5+2x))=0

We add all the numbers together, and all the variables

21x-(3(2x+5))=0



We calculate terms in parentheses: -(3(2x+5)), so:

3(2x+5)

We multiply parentheses

6x+15

Back to the equation:

-(6x+15)



We get rid of parentheses

21x-6x-15=0

We add all the numbers together, and all the variables

15x-15=0

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

15x=15

x=15/15

x=1

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