(-3x + 5) - x where x = 2
-3
x2 + 3x - 4 where x = -3
-4
2(-x + x2 - 4x) where x = -2
28
2x - 3y + 2xy2 where x = 3 and y = 2
24
2x(4x2y + 2y - x) where x = 0.5 and y = -3
-9.5
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