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a in (-oo:+oo)
(-8/7)*a-2 = 4 // - 4
(-8/7)*a-4-2 = 0
-8/7*a-6 = 0 // + 6
-8/7*a = 6 // : -8/7
a = 6/(-8/7)
a = -21/4
a = -21/4
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