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17g-12g+3g+3g-9g=18
We move all terms to the left:
17g-12g+3g+3g-9g-(18)=0
We add all the numbers together, and all the variables
2g-18=0
We move all terms containing g to the left, all other terms to the right
2g=18
g=18/2
g=9
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