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a in (-oo:+oo)
(-1/5)*a-4 = -6 // + 6
(-1/5)*a-4+6 = 0
2-1/5*a = 0 // - 2
-1/5*a = -2 // : -1/5
a = -2/(-1/5)
a = 10
a = 10
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