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x in (-oo:+oo)
(4*x)/5+3 = 12 // - 12
(4*x)/5-12+3 = 0
4/5*x-9 = 0 // + 9
4/5*x = 9 // : 4/5
x = 9/4/5
x = 45/4
x = 45/4
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