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0,5x + 1,5y = 42
x=36-y
0,5(36-y)+1,5y=42
18-0,5y+1,5y=42
18+y=42
y=42-18
y=24
x+24=36
x=36-24
x=12
y=24
0,5x + 1,5y=42
x=36-y
0,5 (36-y) + 1,5y=42
x=36-y
18-0,5y+1,5y=42
x=36-y
y=42-18
x=36-y
y=24
x=36-24
y=24
x=12
y=24
0,5x+1,5y=42
-0,5x-0,5y=-18
0,5x+1,5y=42
1y=24
x+y=36
x+24=36
x=36-24
x=12
x=12
y=24