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a)
4/?=20/14
4*14=20*?
56=20?/:20
2,8=?
b)4/?=10/12
4*12=10*?
48=10?/:10
4,8=?
z.2
a)
4*?=20*12
4?=240/:4
?=60
b)
2*?=10*12
2?=120/:2
?=60