3(x-7)=-4(x-21)

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Solution for 3(x-7)=-4(x-21) equation: 



3(x-7)=-4(x-21)

We move all terms to the left:

3(x-7)-(-4(x-21))=0

We multiply parentheses

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



We calculate terms in parentheses: -(-4(x-21)), so:

-4(x-21)

We multiply parentheses

-4x+84

Back to the equation:

-(-4x+84)



We get rid of parentheses

3x+4x-84-21=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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