X-3(x+4)=9

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Solution for X-3(x+4)=9 equation: 



X-3(X+4)=9

We move all terms to the left:

X-3(X+4)-(9)=0

We multiply parentheses

X-3X-12-9=0

We add all the numbers together, and all the variables

-2X-21=0

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

-2X=21

X=21/-2

X=-10+1/2

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