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a in (-oo:+oo)
(-2/7)*a-(7/8) = -293/280 // + -293/280
(-2/7)*a-(7/8)-(-293/280) = 0
(-2/7)*a-7/8+293/280 = 0
6/35-2/7*a = 0 // - 6/35
-2/7*a = -6/35 // : -2/7
a = -6/35/(-2/7)
a = 3/5
a = 3/5
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