X+21=3x+6

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Solution for X+21=3x+6 equation: 



X+21=3X+6

We move all terms to the left:

X+21-(3X+6)=0

We get rid of parentheses

X-3X-6+21=0

We add all the numbers together, and all the variables

-2X+15=0

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

-2X=-15

X=-15/-2

X=7+1/2

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