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a in (-oo:+oo)
4*a-(3/4) = 161/20-7*a // - 161/20-7*a
4*a-(-7*a)-(3/4)-(161/20) = 0
4*a+7*a-3/4-161/20 = 0
11*a-44/5 = 0 // + 44/5
11*a = 44/5 // : 11
a = 44/5/11
a = 4/5
a = 4/5
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