Solve for g
g=3
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2g-g-g+4g=12
Combine 4g and -2g to get 2g.
g-g+4g=12
Combine 2g and -g to get g.
4g=12
Combine g and -g to get 0.
g=\frac{12}{4}
Divide both sides by 4.
g=3
Divide 12 by 4 to get 3.
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