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a in (-oo:+oo)
(4/5)*a+7*a+4 = 79/10 // - 79/10
(4/5)*a+7*a-(79/10)+4 = 0
(4/5)*a+7*a-79/10+4 = 0
39/5*a-39/10 = 0 // + 39/10
39/5*a = 39/10 // : 39/5
a = 39/10/39/5
a = 1/2
a = 1/2
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