Răspuns :
[tex]3 \times (x - 2.7) - 4.2 = 7.2 \times 1.5 = 10.8[/tex]
[tex]3 \times (x - 2.7) = 10.8 + 4.2 = 15[/tex]
[tex]x - 2.7 = 15 \div 3[/tex]
[tex]x - 2.7 = 5[/tex]
[tex]x = 5 + 2.7[/tex]
[tex]x = 7.7[/tex]
[tex]3 \times (x - 2.7) - 4.2 = 7.2 \times 1.5 = 10.8[/tex]
[tex]3 \times (x - 2.7) = 10.8 + 4.2 = 15[/tex]
[tex]x - 2.7 = 15 \div 3[/tex]
[tex]x - 2.7 = 5[/tex]
[tex]x = 5 + 2.7[/tex]
[tex]x = 7.7[/tex]