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(2x - 1/2) (2x + 4) = 0
x = 1/4 atau x = -2
maka, x₁ = 1/4 dan x₂ = -2
4x₁ - x₂ = (4 x 1/4) - (-2)
= 1 + 2 = 3
semoga membantu :)