Question

Rezolvati ecuatiile in multimea nr naturale:3•{5•[7•(4x-10)-13]-3}+1=7

Answer 1

3•{5•[7•(4x-10)-13]-3}+1=7 => 3× {5×[7×(4x-10)-13]-3}=7-1 => 3× {5×[7×(4x-10)-13]-3}=6 =>5×[7×(4x-10)-13]-3=6 : 3 => 5×[7×(4x-10)-13]-3 = 2 => 5×[7×(4x-10)-13]=3+2 => 5×[7×(4x-10)-13]=5=> 7×(4x-10)-13 =>5:5 => 7×(4x-10)-13 = 1 => 7×(4x-10) = 13 + 1 => 7×(4x-10) = 14 => 4x-10 = 14:7 => 4x-10 = 2 => 4x=10+2 => 4x= 12 => x= 12:4 => x = 3 Coronita? ^-^