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x in (-oo:+oo)
(2/3)*x = 4.2 // - 4.2
(2/3)*x-4.2 = 0
2/3*x-4.2 = 0 // + 4.2
2/3*x = 4.2 // : 2/3
x = 4.2/2/3
x = 6.29999997
x = 6.29999997
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