6+8x=21=3x

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Solution for 6+8x=21=3x equation: 



6+8x=21=3x

We move all terms to the left:

6+8x-(21)=0

We add all the numbers together, and all the variables

8x-15=0

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

8x=15

x=15/8

x=1+7/8

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