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7 * 7^(x-1) - 5 * 5^(x-1) + 2 < 2* 7^(x-1) - 118*5^(x-1)
7^(x-1) = a
5^(x-1) = b
7a - 5b +2 <2a-118b
5a+113b +2 <0
5*7^(x-1) + 113*5^(x-1)+2<0
7^(x-1)>0 i 5^(x-1)>0 => 5*7^(x-1) + 113*5^(x-1)+2<0
równanie jest sprzeczne
7 * 7^(x-1) - 5 * 5^(x-1) + 2 < 2* 7^(x-1) - 118*5^(x-1)
Niech 7^(x-1) = a
5^(x-1) = b
7a - 5b +2 <2a-118b
5a+113b +2 <0
5*7^(x-1) + 113*5^(x-1)+2<0
7^(x-1)>0 i 5^(x-1)>0 => 5*7^(x-1) + 113*5^(x-1)+2<0 jest sprzeczne