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3^(x^2 - 3) = 3^3(x -5)
3^(x^2 - 3) = 3^(3x -15)
x^2 - 3 = 3x - 15
x^2-3x - 3 + 15 = 0
x^2 - 3x + 12 = 0
maka nilai dari
x₁ + x₂ = -b/a
= -(-3)/1
= 3