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a in (-oo:+oo)
6/5-((7/2)*a) = -229/130 // + -229/130
6/5-((7/2)*a)-(-229/130) = 0
(-7/2)*a+6/5+229/130 = 0
77/26-7/2*a = 0 // - 77/26
-7/2*a = -77/26 // : -7/2
a = -77/26/(-7/2)
a = 11/13
a = 11/13
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