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a in (-oo:+oo)
(1/4)*(20-a) = 6-a // - 6-a
(1/4)*(20-a)+a-6 = 0
1/4*(20-a)+a-6 = 0
1/4*(20-a)+a-6 = 0
3/4*a-6+5 = 0
3/4*a-1 = 0
3/4*a-1 = 0
3/4*a-1 = 0 // + 1
3/4*a = 1 // : 3/4
a = 1/3/4
a = 4/3
a = 4/3
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