a) [tex]2\frac{1}{5} + x = 11[/tex]
[tex]\frac{11}{5} + x = 11[/tex]
[tex]x = 11 - \frac{11}{5}[/tex]
[tex]x = 8\frac{4}{5}[/tex]
b) 7x = 15 /:7
[tex]x = \frac{15}{7}[/tex]
[tex]x = 2\frac{1}{7}[/tex]
c) [tex]\frac{1}{8}x = -3[/tex] /*8
[tex]x = -24[/tex]
d) 3 - x = -4
-x = -4 - 3
-x = -7
x = 7
