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x in (-oo:+oo)
25/24 = (9/4)*x+4*x // - (9/4)*x+4*x
25/24-((9/4)*x)-(4*x) = 0
(-9/4)*x-4*x+25/24 = 0
25/24-25/4*x = 0 // - 25/24
-25/4*x = -25/24 // : -25/4
x = -25/24/(-25/4)
x = 1/6
x = 1/6
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