eq1: (-4 * x) + (4 * y) + (2 * z) + 12 = 0
eq2: (-3 * x) - (5 * y) + (3 * z) + 14 = 0
eq3: (-6 * x) + (2 * y) + (2 * z) + 7 = 0
A = PointIn(eq1)