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10x - 40 = 180
10x = 220
x = 22
4y - 2 = 6x - 50
4y - 2 = 132 - 50
4y = 84
y = 21
5z - 20 = 4x + 10
5z - 20 = 88 + 10
5z = 118
z = 118/5 = 23 3/5
x + y + z
= 22 + 21 + 23 3/5
= 66 3/5
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