21x-42-15x=21

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Solution for 21x-42-15x=21 equation: 



21x-42-15x=21

We move all terms to the left:

21x-42-15x-(21)=0

We add all the numbers together, and all the variables

6x-63=0

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

6x=63

x=63/6

x=10+1/2

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