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-x=3
x=-3
sprawdzenie:
27=27
b)
3x-15=0
3x=15 /:3
x=5
c)
2x+6=4
2x=4-6
2x=-2 /:2
x=-1
2]a)
b)(
(
(
3a)
b)
c)
d)
e)··
f)
4)a)
b)7·
5]2·4·3=24