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a in (-oo:+oo)
(4/7)*a-5*a-(5/8) = -547/280 // + -547/280
(4/7)*a-5*a-(5/8)-(-547/280) = 0
(4/7)*a-5*a-5/8+547/280 = 0
93/70-31/7*a = 0 // - 93/70
-31/7*a = -93/70 // : -31/7
a = -93/70/(-31/7)
a = 3/10
a = 3/10
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