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49x^2= 784
x^2 = 784/49
x^2 = 16
x = V16
x= 4
(7x + 28) (7x - 28) = 0
7x + 28 = 0
7x = -28
x₁ = -4
7x - 28 = 0
7x = 28
x₂ = 4
Himpunan Penyelesaian = {x₁, x₂} = {-4, 4}