1) x ≠ 0
A.
[tex]x - 26 = - 26[/tex]
[tex]x = - 26 + 26 = 0[/tex]
B.
[tex]1 \frac{1}{6} x = 0[/tex]
[tex]x = 0 \div 1 \frac{1}{6} = 0[/tex]
C.
[tex]5x = 3x[/tex]
[tex]5x - 3x = 0[/tex]
[tex]2x = 0[/tex]
[tex]x = 0 \div 2 = 0[/tex]
D.
[tex]x + 15 = 14[/tex]
[tex]x = 14 - 15 = - 1[/tex]
-1 ≠ 0
Czyli odp. D.
2)
[tex]x = 0.9y[/tex]
[tex]0.9y = x[/tex]
[tex]y = x \div (0.9)[/tex]
[tex]y = x \div \frac{9}{10} = x \times \frac{10}{9} = \frac{10}{9} x = 1 \frac{1}{9} x[/tex]
Czyli odp. D.
