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D( a )
3-(4*a) = 0
3-(4*a) = 0
3-(4*a) = 0
3-4*a = 0
3-4*a = 0 // - 3
-4*a = -3 // : -4
a = -3/(-4)
a = 3/4
a in (-oo:3/4) U (3/4:+oo)
36/(3-(4*a))-7 = 5 // - 5
36/(3-(4*a))-7-5 = 0
36/(3-4*a)-7-5 = 0
36/(3-4*a)+(-7*(3-4*a))/(3-4*a)+(-5*(3-4*a))/(3-4*a) = 0
36-7*(3-4*a)-5*(3-4*a) = 0
28*a+20*a-15+15 = 0
48*a = 0
(48*a)/(3-4*a) = 0
(48*a)/(3-4*a) = 0 // * 3-4*a
48*a = 0
48*a = 0 // : 48
a = 0
a = 0
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