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a in (-oo:+oo)
1/4-a = (-2/5)*a-(11/4) // - (-2/5)*a-(11/4)
1/4-a-((-2/5)*a)+11/4 = 0
(2/5)*a-a+1/4+11/4 = 0
3-3/5*a = 0 // - 3
-3/5*a = -3 // : -3/5
a = -3/(-3/5)
a = 5
a = 5
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