a)
[tex]x + 3 \frac{3}{4} = 6 \\ x = 6 - 3.75 \\ x = 2.25 = 2 \frac{1}{4} [/tex]
b)
[tex]x - 1 \frac{1}{7} = \frac{5}{7} \\ x = \frac{5}{7} + 1 \frac{1}{7} \\ x = 1 \frac{6}{7} [/tex]
c)
[tex]7 \frac{3}{4} - x = 2 \frac{1}{4} \\ 5 \frac{2}{4} = x \\ x = 5 \frac{2}{4} [/tex]
