a) x = 
b) x = 
c) x = 
d) x = ca - a
e) x = - pn + mn
f) x = 
a) ax + b = c
ax = b - c
x = 
b) m(z + x) = n
z + x = 
x =
c) 
a + b = cx
x = 
d) 
a + x = ca
x = ca - a
e) m - 
mn - x = pn
x = - pn + mn
f) ax + bx = z
x(a + b) = z
x = 