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x in (-oo:+oo)
(-3*x)/(-3) = 8/(-3) // - 8/(-3)
(-3*x)/(-3)-(8/(-3)) = 0
(-3*x)/(-3)+8/3 = 0
x+8/3 = 0 // - 8/3
x = -8/3
x = -8/3
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