21x=7(1+x)

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Solution for 21x=7(1+x) equation: 



21x=7(1+x)

We move all terms to the left:

21x-(7(1+x))=0

We add all the numbers together, and all the variables

21x-(7(x+1))=0



We calculate terms in parentheses: -(7(x+1)), so:

7(x+1)

We multiply parentheses

7x+7

Back to the equation:

-(7x+7)



We get rid of parentheses

21x-7x-7=0

We add all the numbers together, and all the variables

14x-7=0

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

14x=7

x=7/14

x=1/2

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