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Hi, I'm trying to plot the following planes in 3D with Alpha, but am having issues: [*]2x + y - 2 = 0 [*]y + 2z - 4 = 0 [*]x + 3z - 6 = 0 [*]x = 4 [*]y = 2 [*]z = 5 I do need the last 3 in 3D: x is the constant(4), but y and z vary; y is...