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-3/4a- 1/4= 2,25
-0,75a = 2,25+0,25
-0,75a = 2,5 /:-(0,75)
a = 3 1/3
-3/4-1/4b = 2,25
-0,75-0,25b = 2,25
-0,25b = 2,25+0,75
-0,25b = 3 /:(-0,25)
b = 12
-3/4-1/4 = 2,25d
-1 = 2,25d/: 2,25
d = -1/2,25 ≈ 0,44
-2,5c- 8= 17
-2,5c = 17+8
-2,5c = 9 /:(-2,5)
c = -3,6
0,4m-2= -6
0,4m = -6+2
0,4m = -4 /:0,4
m = -10