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x in (-oo:+oo)
y = (-1/3)*x-10 // - (-1/3)*x-10
y-((-1/3)*x)+10 = 0
(1/3)*x+y+10 = 0
1/3*x+y+10 = 0 // - y+10
1/3*x = -(y+10) // : 1/3
x = (-(y+10))/1/3
x = -3*(y+10)
x = -3*(y+10)
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