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2x - x² + 10 - 5x = 2x - 2 (dikalikan - 1)
-2x + x² - 10 + 5x = -2x + 2
x² + 3x - 10 = -2x + 2
x² + 5x - 12 = 0
nilai a = 1, b = 5, dan c = -12
2x-x^2+10-5x=2x-2
-x^2+2x-2x-5x+10+2=0
-x^2-5x+12=0