21-42=4(x-1)-5

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Solution for 21-42=4(x-1)-5 equation: 



21-42=4(x-1)-5

We move all terms to the left:

21-42-(4(x-1)-5)=0

We add all the numbers together, and all the variables

-(4(x-1)-5)-21=0



We calculate terms in parentheses: -(4(x-1)-5), so:

4(x-1)-5

We multiply parentheses

4x-4-5

We add all the numbers together, and all the variables

4x-9

Back to the equation:

-(4x-9)



We get rid of parentheses

-4x+9-21=0

We add all the numbers together, and all the variables

-4x-12=0

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

-4x=12

x=12/-4

x=-3

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