X+4x+6=21

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Solution for X+4x+6=21 equation: 



X+4X+6=21

We move all terms to the left:

X+4X+6-(21)=0

We add all the numbers together, and all the variables

5X-15=0

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

5X=15

X=15/5

X=3

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