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a in (-oo:+oo)
a+7 = 7*a-41 // - 7*a-41
a-(7*a)+7+41 = 0
a-7*a+7+41 = 0
48-6*a = 0 // - 48
-6*a = -48 // : -6
a = -48/(-6)
a = 8
a = 8
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