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630/g=21
We move all terms to the left:
630/g-(21)=0
Domain of the equation: g!=0We multiply all the terms by the denominator
g∈R
-21*g+630=0
We add all the numbers together, and all the variables
-21g+630=0
We move all terms containing g to the left, all other terms to the right
-21g=-630
g=-630/-21
g=+30
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