(x+y)/15-(x-y)/3=1
(2x-y)/6-(3x+2y)/3=-25
x+y-5x+5y=15
2x-y-6x-4y=-150
-4x+6y=15
-4x-5y=-150
y=15
-4x-5•15=-150
x=75/4
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(x+y)/15-(x-y)/3=1
(2x-y)/6-(3x+2y)/3=-25
x+y-5x+5y=15
2x-y-6x-4y=-150
-4x+6y=15
-4x-5y=-150
y=15
-4x-5•15=-150
x=75/4