2 - a - 2b + ab for a =  3 and b = -1, -17 - -x2 - 2(x + 1) for x = 3, -16 - c2 - d2 for c = -3 and d = 5, 3 - c(3 - d) - c2 for c = -3 and d = 5, -69 - -d2 - 4(d - 2c) for c = -3 and d = 5, 26 - 5y - 3z + 4y - z - 3y for y = 3 and z = -2, 28 - 3(2c + d) - d for c = 5 and d = -1, -70 - -5(x + 2y) + 15(x + 2y) for x = -15 and n = -18,

Evaluating Variable Expressions

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