7.5g-8.1=21.9

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Solution for 7.5g-8.1=21.9 equation: 



7.5g-8.1=21.9

We move all terms to the left:

7.5g-8.1-(21.9)=0

We add all the numbers together, and all the variables

7.5g-30=0

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

7.5g=30

g=30/7.5

g=4

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