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a in (-oo:+oo)
(4/5)*a+7 = 7*a+139/11 // - 7*a+139/11
(4/5)*a-(7*a)-(139/11)+7 = 0
(4/5)*a-7*a-139/11+7 = 0
-31/5*a-62/11 = 0 // + 62/11
-31/5*a = 62/11 // : -31/5
a = 62/11/(-31/5)
a = -10/11
a = -10/11
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