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y=2x-10
z=3x-20
x+y+z=150
x+2x-10+3x-20=150
6x=180
x=180/6
x=30
y=2(30)-10
y=60-10
y=50
z=3(30)-20
z=90-20
z=70
x+y+z=150
30+50+70=150
150=150
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