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x in (-oo:+oo)
y = -((200/13)*x)-100/13 // + -((200/13)*x)-100/13
(200/13)*x+y-(-100/13) = 0
(200/13)*x+y+100/13 = 0
200/13*x+y+100/13 = 0 // - y+100/13
200/13*x = -(y+100/13) // : 200/13
x = (-(y+100/13))/200/13
x = -13/200*(y+100/13)
x = -13/200*(y+100/13)
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