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a in (-oo:+oo)
(2/3)*a-(3/4) = 3/4 // - 3/4
(2/3)*a-(3/4)-(3/4) = 0
(2/3)*a-3/4-3/4 = 0
2/3*a-3/2 = 0 // + 3/2
2/3*a = 3/2 // : 2/3
a = 3/2/2/3
a = 9/4
a = 9/4
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