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7 (3x-5)+23=114
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Răspuns :

7 (3x-5)+23=114
21x-35+23=114
21x=114+12
21x=126
=> x=6
7(3x-5)+23=114 <=> 21x-35+23=114 <=> 21x-12=114 <=> 21x=114+12 <=> 21x=126 <=> x=126:21 <=> x= 6 <=> S={6}
Sper ca te-am ajutat !