20=4(-1+x)

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Solution for 20=4(-1+x) equation: 



20=4(-1+x)

We move all terms to the left:

20-(4(-1+x))=0

We add all the numbers together, and all the variables

-(4(x-1))+20=0



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

4(x-1)

We multiply parentheses

4x-4

Back to the equation:

-(4x-4)



We get rid of parentheses

-4x+4+20=0

We add all the numbers together, and all the variables

-4x+24=0

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

-4x=-24

x=-24/-4

x=+6

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