You can put this solution on YOUR website! That inequality has two variables. Assuming typographical mistake, then let's choose g and NOT G. (If you do mean both g and G, then supply missing information.)
2(3+3g)>= 2g+14 [assumed given]
6+6g>=2g+14 [perform operation, distributive prop]
6-6+6g-2g>=2g-2g+14-6 [additive inverses]
0+4g>=0+8 [perform operations or computations]
4g>=8 [additive identity element 0]
g>=8/4, g>=2. [Divide by positive number]
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