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a in (-oo:+oo)
(3/5)*a+(3/5)*a+8 = 42/5 // - 42/5
(3/5)*a+(3/5)*a-(42/5)+8 = 0
(3/5)*a+(3/5)*a-42/5+8 = 0
6/5*a-2/5 = 0 // + 2/5
6/5*a = 2/5 // : 6/5
a = 2/5/6/5
a = 1/3
a = 1/3
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