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x in (-oo:+oo)
(-5/2)*x-((1/2)*y) = 4 // - 4
(-5/2)*x-((1/2)*y)-4 = 0
(-5/2)*x+(-1/2)*y-4 = 0
-5/2*x-1/2*y-4 = 0 // + -1/2*y-4
-5/2*x = -(-1/2*y-4) // : -5/2
x = (-(-1/2*y-4))/(-5/2)
x = -2/5*(4-(-1/2*y))
x = -2/5*(4-(-1/2*y))
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