6+15x=21

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Solution for 6+15x=21 equation: 



6+15x=21

We move all terms to the left:

6+15x-(21)=0

We add all the numbers together, and all the variables

15x-15=0

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

15x=15

x=15/15

x=1

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