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10 = (-5/2)*x-y // - (-5/2)*x-y
y-((-5/2)*x)+10 = 0
(5/2)*x+y+10 = 0
5/2*x+y+10 = 0 // - y+10
5/2*x = -(y+10) // : 5/2
x = (-(y+10))/5/2
x = -2/5*(y+10)
x = -2/5*(y+10)
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