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a)
5x - b = 2x + c
5x - 2x = c + b
3x = b + c /:3
b)
ax - b = cx - d
ax - cx = -d + b
(a-c)x = b - d / (a-c) z.: a-c≠0 ⇒ a≠c
c)
ax² + bc = d
ax² = d - bc /:a z.: a≠0
d)
2(a + 2x) + x = b(x + c)
2a + 4x + x = bx + bc
5x + bx = bc - 2a
(5 - b)x = bc -2a /:(5-b) z.: 5-b≠0 ⇒ b≠5
e) z.: c≠0
f) z.: x-b≠0 ⇒ x≠b