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a in (-oo:+oo)
(3/4)*(5*a-3) = 3/8 // - 3/8
(3/4)*(5*a-3)-(3/8) = 0
(3/4)*(5*a-3)-3/8 = 0
3/4*(5*a-3)-3/8 = 0
(3/4*8*(5*a-3))/8-3/8 = 0
3/4*8*(5*a-3)-3 = 0
30*a-21 = 0
(30*a-21)/8 = 0
(30*a-21)/8 = 0 // * 8
30*a-21 = 0
30*a-21 = 0 // + 21
30*a = 21 // : 30
a = 21/30
a = 7/10
a = 7/10
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