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x in (-oo:+oo)
(1/3)*x = 1.8 // - 1.8
(1/3)*x-1.8 = 0
1/3*x-1.8 = 0 // + 1.8
1/3*x = 1.8 // : 1/3
x = 1.8/1/3
x = 5.40000005
x = 5.40000005
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