-3(a-2)+1=20

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Solution for -3(a-2)+1=20 equation: 



-3(a-2)+1=20

We move all terms to the left:

-3(a-2)+1-(20)=0

We add all the numbers together, and all the variables

-3(a-2)-19=0

We multiply parentheses

-3a+6-19=0

We add all the numbers together, and all the variables

-3a-13=0

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

-3a=13

a=13/-3

a=-4+1/3

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