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a in (-oo:+oo)
(5/3)*a+3/4 = 7/12 // - 7/12
(5/3)*a+3/4-(7/12) = 0
(5/3)*a+3/4-7/12 = 0
5/3*a+1/6 = 0 // - 1/6
5/3*a = -1/6 // : 5/3
a = -1/6/5/3
a = -1/10
a = -1/10
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