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x in (-oo:+oo)
18/52 = (2*x)/13 // - (2*x)/13
18/52-((2*x)/13) = 0
(-2/13)*x+18/52 = 0
9/26-2/13*x = 0 // - 9/26
-2/13*x = -9/26 // : -2/13
x = -9/26/(-2/13)
x = 9/4
x = 9/4
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