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x in (-oo:+oo)
(3*x)/7.2 = 5 // - 5
(3*x)/7.2-5 = 0
0.41666667*x-5 = 0 // + 5
0.41666667*x = 5 // : 0.41666667
x = 5/0.41666667
x = 11.9999999
x = 11.9999999
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