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a in (-oo:+oo)
(3/7)*a+3/8 = 153/280 // - 153/280
(3/7)*a+3/8-(153/280) = 0
(3/7)*a+3/8-153/280 = 0
3/7*a-6/35 = 0 // + 6/35
3/7*a = 6/35 // : 3/7
a = 6/35/3/7
a = 2/5
a = 2/5
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