Solve for g
g=3
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\frac{20}{4}=g+2
Divide both sides by 4.
5=g+2
Divide 20 by 4 to get 5.
g+2=5
Swap sides so that all variable terms are on the left hand side.
g=5-2
Subtract 2 from both sides.
g=3
Subtract 2 from 5 to get 3.
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