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a in (-oo:+oo)
(-2/3)*a-5 = 5*a-28/9 // - 5*a-28/9
(-2/3)*a-(5*a)-(-28/9)-5 = 0
(-2/3)*a-5*a+28/9-5 = 0
-17/3*a-17/9 = 0 // + 17/9
-17/3*a = 17/9 // : -17/3
a = 17/9/(-17/3)
a = -1/3
a = -1/3
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