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x in (-oo:+oo)
(1/2)*x+4 = 10*y // - 10*y
(1/2)*x-(10*y)+4 = 0
(1/2)*x-10*y+4 = 0
1/2*x-10*y+4 = 0 // - 4-10*y
1/2*x = -(4-10*y) // : 1/2
x = (-(4-10*y))/1/2
x = -2*(4-10*y)
x = -2*(4-10*y)
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