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5x - 8x - 7 - 5 = 0
-3x - 12 = 0
x = 12/-3
x = -4
nilai 3x + 2
= 3(-4) + 2
= -12 + 2
= -10
-3x = 12
x = 12/-3
= -4
nilai 3x + 2 = 3(-4) + 2 = -12 + 2 = -10