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x in (-oo:+oo)
y+13 = (1/2)*(x+12) // - (1/2)*(x+12)
y-((1/2)*(x+12))+13 = 0
(-1/2)*(x+12)+y+13 = 0
y-1/2*(x+12)+13 = 0
y-1/2*(x+12)+13 = 0
y-1/2*x-6+13 = 0
y-1/2*x+7 = 0
y-1/2*x+7 = 0
y-1/2*x+7 = 0 // - y+7
-1/2*x = -(y+7) // : -1/2
x = (-(y+7))/(-1/2)
x = 2*(y+7)
x = 2*(y+7)
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