` C1: `
` (2/3)^{x} . (2/3)^{5} = 32/243 `
` <=> (2/3)^{x} . (2/3)^{5} = (2/3)^{5} `
` <=> (2/3)^{x} = 1 `
` <=> x = 0 `
` C2: `
` (2/3)^{x} . (2/3)^{5} = 32/243 `
` <=> (2/3)^{x} . (2/3)^{5} = (2/3)^{5} `
` <=> (2/3)^{x + 5} = (2/3)^{5} `
` <=> x + 5 = 5 `
` <=> x = 0 `