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a in (-oo:+oo)
a-251/252 = (-5/6)*((7/2)*a+1)-((2/7)*a) // - (-5/6)*((7/2)*a+1)-((2/7)*a)
a-((-5/6)*((7/2)*a+1))+(2/7)*a-251/252 = 0
(5/6)*((7/2)*a+1)+a+(2/7)*a-251/252 = 0
5/6*(7/2*a+1)+a+(2*a)/7-251/252 = 0
(5/6*7*252*(7/2*a+1))/(7*252)+(7*252*a)/(7*252)+(2*252*a)/(7*252)+(-251*7)/(7*252) = 0
5/6*7*252*(7/2*a+1)+7*252*a+2*252*a-251*7 = 0
6909*a+504*a-1757+1470 = 0
7413*a-1757+1470 = 0
7413*a-287 = 0
(7413*a-287)/(7*252) = 0
(7413*a-287)/(7*252) = 0 // * 7*252
7413*a-287 = 0
7413*a-287 = 0 // + 287
7413*a = 287 // : 7413
a = 287/7413
a = 41/1059
a = 41/1059
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