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x=4
4v=2x+v
4v=2*4+v
4v=8+v
3v=8
v=
v=
x=4
b) 4v=2x+v
4v=8+v
4v-v=8
3v=8 // :3
v= 2 i w ułamku zwykłym 2/3
c) 7c+v=10x
7c+ 2 2/3 =40
7c= 40-2 2/3
7c= 37 1/3 // :7
c= 5 1/3