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3.[2.(2.a+3)-17]+25=52

Răspuns :

3x[2x(2xa+3)-17]+25=52 <=> 3x[2x(2xa+3)-17]=52-25 <=> 3x[2x(2xa+3)-17]=27 <=> 2x(2xa+3)-17=27:3 <=> 2x(2xa+3)-17=9 <=> 2x(2xa+3)=9+17 <=> 2x(2xa+3)=26 <=> 2xa+3=26:2 <=> 2xa+3=13 <=> 2xa=13-3 <=> 2xa=10 => a=10:2=5