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a in (-oo:+oo)
(1/3)*a+2 = 50/27 // - 50/27
(1/3)*a-(50/27)+2 = 0
(1/3)*a-50/27+2 = 0
1/3*a+4/27 = 0 // - 4/27
1/3*a = -4/27 // : 1/3
a = -4/27/1/3
a = -4/9
a = -4/9
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