[tex]\bf 90:x=14\:\:|\cdot x \:\: \text{\it inmultim toata relatia cu x}[/tex]
[tex]\bf 90 = 14x\:\:|:2 \:\: \text{\it (inpartim toata relatia cu 2)}[/tex]
[tex]\bf 45= 7x[/tex]
[tex]\boxed{\bf x = \dfrac{45}{7}}[/tex] sau [tex]\boxed{\bf x = 6\dfrac{3}{7}}[/tex]
