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a in (-oo:+oo)
(1/14)*(a-4) = (2/7)*(a+6)-((1/7)*a) // - (2/7)*(a+6)-((1/7)*a)
(1/14)*(a-4)-((2/7)*(a+6))+(1/7)*a = 0
(1/14)*(a-4)+(-2/7)*(a+6)+(1/7)*a = 0
1/14*(a-4)-2/7*(a+6)+a/7 = 0
(1/14*7*(a-4))/7+(-2/7*7*(a+6))/7+a/7 = 0
1/14*7*(a-4)-2/7*7*(a+6)+a = 0
a-3/2*a-14 = 0
-1/2*a-14 = 0
(-1/2*a-14)/7 = 0
(-1/2*a-14)/7 = 0 // * 7
-1/2*a-14 = 0
-1/2*a-14 = 0 // + 14
-1/2*a = 14 // : -1/2
a = 14/(-1/2)
a = -28
a = -28
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