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