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