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a in (-oo:+oo)
4-3*a = 2*a+39 // - 2*a+39
4-3*a-(2*a)-39 = 0
4-3*a-2*a-39 = 0
-5*a-35 = 0 // + 35
-5*a = 35 // : -5
a = 35/(-5)
a = -7
a = -7
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