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x in (-oo:+oo)
(1/2)*x-((3/5)*y) = 13/20 // - 13/20
(1/2)*x-((3/5)*y)-(13/20) = 0
(1/2)*x+(-3/5)*y-13/20 = 0
1/2*x-3/5*y-13/20 = 0 // + -3/5*y-13/20
1/2*x = -(-3/5*y-13/20) // : 1/2
x = (-(-3/5*y-13/20))/1/2
x = 2*(13/20-(-3/5*y))
x = 2*(13/20-(-3/5*y))
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