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x in (-oo:+oo)
y+3 = (1/2)*(x+10) // - (1/2)*(x+10)
y-((1/2)*(x+10))+3 = 0
(-1/2)*(x+10)+y+3 = 0
y-1/2*(x+10)+3 = 0
y-1/2*(x+10)+3 = 0
y-1/2*x-5+3 = 0
y-1/2*x-2 = 0
y-1/2*x-2 = 0
y-1/2*x-2 = 0 // - y-2
-1/2*x = -(y-2) // : -1/2
x = (-(y-2))/(-1/2)
x = -2*(2-y)
x = -2*(2-y)
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