a)(12x+1)(3x-1)-(6x+2)^2=10
6x-1/4  - 3x+1 / 3 = 1/4 - это дроби. Не дробь 1/4 и 1/3, а именно 6x-1 /4  

(3x+7)*(3x-7)-3x*(3x+1)=5
Прошу, объясните как решать!
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