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x in (-oo:+oo)
1-((2/5)*y) = 4*x-3 // - 4*x-3
1-(4*x)-((2/5)*y)+3 = 0
(-2/5)*y-4*x+1+3 = 0
4-4*x-2/5*y = 0 // - 4-2/5*y
-4*x = -(4-2/5*y) // : -4
x = (-(4-2/5*y))/(-4)
x = (4-2/5*y)/4
x = (4-2/5*y)/4
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