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(5*a)/6+(3*a)/4-(7/12) = 13/6 // - 13/6
(5*a)/6+(3*a)/4-(7/12)-(13/6) = 0
(5*a)/6+(3*a)/4-7/12-13/6 = 0
19/12*a-11/4 = 0 // + 11/4
19/12*a = 11/4 // : 19/12
a = 11/4/19/12
a = 33/19
a = 33/19
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