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z in (-oo:+oo)
48-((8*z)/7) = -z // + z
z-((8*z)/7)+48 = 0
(-8/7)*z+z+48 = 0
48-1/7*z = 0 // - 48
-1/7*z = -48 // : -1/7
z = -48/(-1/7)
z = 336
z = 336
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