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z + 15 = x => z = x - 15
x + y + z = 45
=> x + (x - 10) + (x - 15) = 45
=> 3x - 25 = 45
=> 3x = 70
=> x = 70/3
y = x - 10 = 70/3 - 10 = 40/3
z = x - 15 = 70/3 - 15 = 25/3