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