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6.9g+8=3.9g+23
We move all terms to the left:
6.9g+8-(3.9g+23)=0
We get rid of parentheses
6.9g-3.9g-23+8=0
We add all the numbers together, and all the variables
3g-15=0
We move all terms containing g to the left, all other terms to the right
3g=15
g=15/3
g=5
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