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a in (-oo:+oo)
(3/7)*a-5*a+10 = 102/7 // - 102/7
(3/7)*a-5*a-(102/7)+10 = 0
(3/7)*a-5*a-102/7+10 = 0
-32/7*a-32/7 = 0 // + 32/7
-32/7*a = 32/7 // : -32/7
a = 32/7/(-32/7)
a = -1
a = -1
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