X-3(1+3x)=21

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



X-3(1+3X)=21

We move all terms to the left:

X-3(1+3X)-(21)=0

We add all the numbers together, and all the variables

X-3(3X+1)-21=0

We multiply parentheses

X-9X-3-21=0

We add all the numbers together, and all the variables

-8X-24=0

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

-8X=24

X=24/-8

X=-3

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