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x - 10 when x = 19 *
4 points
3a - 8 when a = 6 *
4 points
4d + x when d = 4 and x = 8 *
4 points
6b - 3c when b= 3 and c = 4 *
4 points
5(x+ y) when x = -2 and y = -3 *
4 points