x + y = 15 /*(-10)
0,1x + 0,04y = 0,90
-10x-10y=-150
10x+4y=90
-6y=-60
y=10
x=5
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x + y = 15 /*(-10)
0,1x + 0,04y = 0,90
-10x-10y=-150
10x+4y=90
-6y=-60
y=10
x=5