x/3 - g = a for x

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x/3 - g = a for x

Add g to each side so we can isolate the x term:
x/3 - g + g = a + g

Cancel the g terms on the left side and we get:
x/3 = a + g

Multiply each side by 3 to isolate x:
3(x/3) = 3(a + g)

Cancelling the 3's on the left side, we get:
x = 3(a + g)