16.5+.5x=21

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Solution for 16.5+.5x=21 equation: 



16.5+.5x=21

We move all terms to the left:

16.5+.5x-(21)=0

We add all the numbers together, and all the variables

.5x-4.5=0

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

.5x=4.5

x=4.5/.5

x=9

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