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4x+8=20
4x=12
x=3
odp. dwa boki mają po 3cm, a dwa po 7cm
x- krótki bok
x+4 - długi bok
2x + 2(x+4) = 20
2x+2x+8=20
4x=12
x=3
x+4 = 7
a = x
b = x+4
obw = 2a + 2b
obw = 2x + 2x + 8 = 20
a= 4x = 20 - 8
a= 4x = 12 /4
a= x = 3
a = 3
b = 8