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a in (-oo:+oo)
(2*a-13)/3 = 4*a-28 // - 4*a-28
(2*a-13)/3-(4*a)+28 = 0
(2*a-13)/3-4*a+28 = 0
(2*a-13)/3+(-4*3*a)/3+(3*28)/3 = 0
2*a-4*3*a+3*28-13 = 0
84-10*a-13 = 0
71-10*a = 0
(71-10*a)/3 = 0
(71-10*a)/3 = 0 // * 3
71-10*a = 0
71-10*a = 0 // - 71
-10*a = -71 // : -10
a = -71/(-10)
a = 71/10
a = 71/10
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