a)
[tex]x + 2 = \frac{1}{x} | \times x \\ 2x + 2x = 1 \\ 4x = 1 \\ x = \frac{1}{4} [/tex]
b)
[tex]2c + d = 4a \times b | \div b \\ \frac{2c + d}{b} = 4a | \div 4 \\ \frac{ \frac{2c + d}{b} }{4} = a[/tex]
c)
[tex] \frac{8x}{2y} = 4 | \times 2y \\ 8x = 8y \\ x = y[/tex]
d)
[tex] \frac{12x}{4} = {x}^{2} \times t | \times 4 \\ 12x = 4 {x}^{2} \times 4t | \div 4 {x}^{2} \\ \frac{12x}{4 {x}^{2} } = 4t | \div 4 \\ \frac{ \frac{12x}{4 {x}^{2} } }{4} = t[/tex]
Myślę że pomogłem ;)
