15+3*x=21

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Solution for 15+3*x=21 equation: 



15+3x=21

We move all terms to the left:

15+3x-(21)=0

We add all the numbers together, and all the variables

3x-6=0

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

3x=6

x=6/3

x=2

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