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x in (-oo:+oo)
(2/3)*x = -5/21 // + -5/21
(2/3)*x-(-5/21) = 0
(2/3)*x+5/21 = 0
2/3*x+5/21 = 0 // - 5/21
2/3*x = -5/21 // : 2/3
x = -5/21/2/3
x = -5/14
x = -5/14
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