X+3+3x=21

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



X+3+3X=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

4X-18=0

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

4X=18

X=18/4

X=4+1/2

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