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x in (-oo:+oo)
y+10 = (9/2)*(x+10) // - (9/2)*(x+10)
y-((9/2)*(x+10))+10 = 0
(-9/2)*(x+10)+y+10 = 0
y-9/2*(x+10)+10 = 0
y-9/2*(x+10)+10 = 0
y-9/2*x-45+10 = 0
y-9/2*x-35 = 0
y-9/2*x-35 = 0
y-9/2*x-35 = 0 // - y-35
-9/2*x = -(y-35) // : -9/2
x = (-(y-35))/(-9/2)
x = -2/9*(35-y)
x = -2/9*(35-y)
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