8x+15=21

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Solution for 8x+15=21 equation: 



8x+15=21

We move all terms to the left:

8x+15-(21)=0

We add all the numbers together, and all the variables

8x-6=0

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

8x=6

x=6/8

x=3/4

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