21(x-2)=7(4x+9)

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Solution for 21(x-2)=7(4x+9) equation: 



21(x-2)=7(4x+9)

We move all terms to the left:

21(x-2)-(7(4x+9))=0

We multiply parentheses

21x-(7(4x+9))-42=0



We calculate terms in parentheses: -(7(4x+9)), so:

7(4x+9)

We multiply parentheses

28x+63

Back to the equation:

-(28x+63)



We get rid of parentheses

21x-28x-63-42=0

We add all the numbers together, and all the variables

-7x-105=0

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

-7x=105

x=105/-7

x=-15

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