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a in (-oo:+oo)
(2*a-1)/3 = 5.6 // - 5.6
(2*a-1)/3-5.6 = 0
(2*a-1)/3+(-5.6*3)/3 = 0
2*a-5.6*3-1 = 0
2*a-17.8 = 0
(2*a-17.8)/3 = 0
(2*a-17.8)/3 = 0 // * 3
2*a-17.8 = 0
2*a-17.8 = 0 // + 17.8
2*a = 17.8 // : 2
a = 17.8/2
a = 8.9
a = 8.9
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