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a in (-oo:+oo)
4*a+3 = 6*a+13 // - 6*a+13
4*a-(6*a)-13+3 = 0
4*a-6*a-13+3 = 0
-2*a-10 = 0 // + 10
-2*a = 10 // : -2
a = 10/(-2)
a = -5
a = -5
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