4.2g+9=1.2g+21

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Solution for 4.2g+9=1.2g+21 equation: 



4.2g+9=1.2g+21

We move all terms to the left:

4.2g+9-(1.2g+21)=0

We get rid of parentheses

4.2g-1.2g-21+9=0

We add all the numbers together, and all the variables

3g-12=0

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

3g=12

g=12/3

g=4

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