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x in (-oo:+oo)
y-13 = (1/2)*(8*x-14) // - (1/2)*(8*x-14)
y-((1/2)*(8*x-14))-13 = 0
(-1/2)*(8*x-14)+y-13 = 0
y-1/2*(8*x-14)-13 = 0
y-1/2*(8*x-14)-13 = 0
y-4*x-13+7 = 0
y-4*x-6 = 0
y-4*x-6 = 0
y-4*x-6 = 0 // - y-6
-4*x = -(y-6) // : -4
x = (-(y-6))/(-4)
x = (6-y)/(-4)
x = (6-y)/(-4)
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