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3x+y=0 -
-2x=-25
x=25/2
3(25/2)+y=0
37,5+y=0
y=37,5
x+y=-25
3x+y=0 -
-2x=-25
x=25/2
x=12,5
x+y=25
12,5+y=25
y=25-12,5
y=12,5