X+3(a-1)=3(2+1)

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



X+3(X-1)=3(2+1)

We move all terms to the left:

X+3(X-1)-(3(2+1))=0

We add all the numbers together, and all the variables

X+3(X-1)-(33)=0

We add all the numbers together, and all the variables

X+3(X-1)-33=0

We multiply parentheses

X+3X-3-33=0

We add all the numbers together, and all the variables

4X-36=0

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

4X=36

X=36/4

X=9

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