Nathaniel writes the general form of the equation gm = cm + rg for when the equation is solved for m. He uses the general form to solve the equation –3m = 4m – 15 for m. Which expression shows what Nathaniel will actually evaluate? 4 + 15 – 3 4 – 15 + 3 StartFraction negative 15 Over negative 3 minus 4 EndFraction. –15 – negative 15 minus StartFraction negative 3 Over 4 EndFraction.