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a in (-oo:+oo)
(a-6)/5 = 7/12 // - 7/12
(a-6)/5-(7/12) = 0
(a-6)/5-7/12 = 0
(12*(a-6))/(5*12)+(-7*5)/(5*12) = 0
12*(a-6)-7*5 = 0
12*a-107 = 0
(12*a-107)/(5*12) = 0
(12*a-107)/(5*12) = 0 // * 5*12
12*a-107 = 0
12*a-107 = 0 // + 107
12*a = 107 // : 12
a = 107/12
a = 107/12
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