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(-3x + 87)(x - 5) = 0
-3x + 87 = 0 atau x - 5 = 0
-3x = - 87 x = 5
x = -87/-3
x = 29
menjadi
x^2 - 34x + 145 =0
(x-29)(x-5) =0
x-29 =0
x = 29
atau
x-5 =0
x = 5