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a in (-oo:+oo)
(2/3)*a+3 = 83/33 // - 83/33
(2/3)*a-(83/33)+3 = 0
(2/3)*a-83/33+3 = 0
2/3*a+16/33 = 0 // - 16/33
2/3*a = -16/33 // : 2/3
a = -16/33/2/3
a = -8/11
a = -8/11
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