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x in (-oo:+oo)
4-x = (1/4)*x // - (1/4)*x
4-x-((1/4)*x) = 0
(-1/4)*x-x+4 = 0
4-5/4*x = 0 // - 4
-5/4*x = -4 // : -5/4
x = -4/(-5/4)
x = 16/5
x = 16/5
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