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13g-9g=20
We simplify the equation to the form, which is simple to understand
13g-9g=20
We move all terms containing g to the left and all other terms to the right.
+13g-9g=+20
We simplify left and right side of the equation.
+4g=+20
We divide both sides of the equation by 4 to get g.
g=5
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