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a in (-oo:+oo)
4*a-((1/2)*a)+1/10 = 397/120 // - 397/120
4*a-((1/2)*a)+1/10-(397/120) = 0
4*a+(-1/2)*a+1/10-397/120 = 0
7/2*a-77/24 = 0 // + 77/24
7/2*a = 77/24 // : 7/2
a = 77/24/7/2
a = 11/12
a = 11/12
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