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6 1/2 -x = 2 1/4
13/2 - x = 9/4
5 3/5 *x = 7
28/5 x= 7 /*5
28x = 35
x= 35/28
x= 5/4
9.
x=-2 1/4 + 6 1/2. 13/2= 26/4
x = - 9/4 + 26/4
x=17/4
x = 4 1/4
b) -x= 7-5 3/5 /:(-1)
x= -7+5 3/5
x= - 1 2/5
9. 3,5 l : 14 = 0,25 l
0,25l = 250ml