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