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a in (-oo:+oo)
4*a-8 = 7*a+4 // - 7*a+4
4*a-(7*a)-8-4 = 0
4*a-7*a-8-4 = 0
-3*a-12 = 0 // + 12
-3*a = 12 // : -3
a = 12/(-3)
a = -4
a = -4
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