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x in (-oo:+oo)
(3/5)*x-6 = 7.2 // - 7.2
(3/5)*x-7.2-6 = 0
3/5*x-13.2 = 0 // + 13.2
3/5*x = 13.2 // : 3/5
x = 13.2/3/5
x = 22
x = 22
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