a) =>5 la puterea 2+5(55-x supra 5)=125 => 25+275-x=125=>300-x=125=>-x=125-300=>-x=-175=> x=175
b) => 5 la puterea 56 : 5 la puterea 24- 5(55+ x supra 5) = 25=>5 la puterea 32-275-x=25=>-x=25-5 la puterea 32+275=>-x=300-5 a puterea 32=> x =-300+ 5 la puterea 32