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x in (-oo:+oo)
4.18 = (25/100)*x // - (25/100)*x
4.18-((25/100)*x) = 0
(-1/4)*x+4.18 = 0
4.18-1/4*x = 0 // - 4.18
-1/4*x = -4.18 // : -1/4
x = -4.18/(-1/4)
x = 16.72
x = 16.72
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