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12 = (-3/2)*(-6*x-3) // - (-3/2)*(-6*x-3)
12-((-3/2)*(-6*x-3)) = 0
(3/2)*(-6*x-3)+12 = 0
3/2*(-6*x-3)+12 = 0
3/2*(-6*x-3)+12 = 0
15/2-9*x = 0
15/2-9*x = 0
15/2-9*x = 0 // - 15/2
-9*x = -15/2 // : -9
x = -15/2/(-9)
x = 5/6
x = 5/6
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