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Anonymous
7+7z
7=7*1
7z=7*z
7(1+z) is factored form
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2(x - 3y + 7z)
4.2/7=0.6
z / (1/7) = 7z.
(7z - 4)(4z - 7) so z = 4/7 or 7/4
7z - 9.4 = 11.6 7z = 11.6 + 9.4 = 21 z = 21/7 = 3