6-3(x-1)=21

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Solution for 6-3(x-1)=21 equation: 



6-3(x-1)=21

We move all terms to the left:

6-3(x-1)-(21)=0

We add all the numbers together, and all the variables

-3(x-1)-15=0

We multiply parentheses

-3x+3-15=0

We add all the numbers together, and all the variables

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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