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0,9 /3*9 * 3/5 + 8/5 = 0,1/5 + 8/5 = 8,1/5 = 1,62
14.
ax = 3x -3b
ax -3x = -3b
x(a -3) = -3b
x = -3b/(a-3)
15.
o - wiek ojca
s - wiek syna
o+s=32 i o=7s
7s + s = 32
8s = 32
s = 4