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a in (-oo:+oo)
4*a+6 = 3*a+45/8 // - 3*a+45/8
4*a-(3*a)-(45/8)+6 = 0
4*a-3*a-45/8+6 = 0
a+3/8 = 0 // - 3/8
a = -3/8
a = -3/8
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