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x in (-oo:+oo)
(3/10)*x = 12/5 // - 12/5
(3/10)*x-(12/5) = 0
(3/10)*x-12/5 = 0
3/10*x-12/5 = 0 // + 12/5
3/10*x = 12/5 // : 3/10
x = 12/5/3/10
x = 8
x = 8
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