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x - szukana liczba
5x = 28 + x |-x
4x = 28 |:4
x = 7
b)
x - szukana liczba
3x - 16 = x-4 |+16
3x = x +12 |-x
2x = 12
x = 6
c)
x - szukana liczba
(x - 16)*3 = x + 8
3x - 48 = x + 8 |-x
2x - 48 = 8 | +48
2x = 56 |:2
x = 28