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x in (-oo:+oo)
(216/5)*x-3 = 12 // - 12
(216/5)*x-12-3 = 0
216/5*x-15 = 0 // + 15
216/5*x = 15 // : 216/5
x = 15/216/5
x = 25/72
x = 25/72
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