[tex]x + 2.71 = 4x + 1.69 \\ 4x - x = 2.71 - 1.69 \\ 3x = 1.02 \\ x = 1.02 \div 3 \\ x = 0.34 \\ verificare \\ 0.34 + 2.71 = 4 \times 0.34 + 1.69 \\ 3.05 = 1.36 + 1.69 \\ 3.05 = 3.05 \: (adevarat)[/tex]
