12+0.5x=21

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Solution for 12+0.5x=21 equation: 



12+0.5x=21

We move all terms to the left:

12+0.5x-(21)=0

We add all the numbers together, and all the variables

0.5x-9=0

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

0.5x=9

x=9/0.5

x=18

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