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Find the value of  x so that f(x)=7
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Find the value of  x so that f(x)=7

User Ananth Joshi
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Check:   Is  f(8) = 7    ?       2(8) - 9 = 7   ?        16 - 9 = 7   ?            7 = 7   ?yes
User Slotheroo
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