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obustonnie dodać 5
102 = 2x
2x = 102
x = 102:2
x = 51
b) 43=7+9x
obustronnie odjąć 7
36 = 9x
9x = 36
x = 36:9
x = 4
c) 17=11-12x
obustronnie odjąć 11
6 = 12x
12x = 6
x = 1/2 (jedna druga)
d) 3 2/3=1/2x-1/3
obustronnie dodać 1/3
4 = 1/2x
1/2x = 4
x = 4*2
x=8