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x in (-oo:+oo)
(1/2)*y = (5/3)*x-49-6 // - (5/3)*x-49-6
(1/2)*y-((5/3)*x)+6+49 = 0
(-5/3)*x+(1/2)*y+6+49 = 0
1/2*y-5/3*x+55 = 0 // - 1/2*y+55
-5/3*x = -(1/2*y+55) // : -5/3
x = (-(1/2*y+55))/(-5/3)
x = 3/5*(1/2*y+55)
x = 3/5*(1/2*y+55)
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