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b) 0,5a+0,6-0,6+0,5a= 1a
c) 0,7x+5z+0,002y-4,05z+1,4x=2,1x+0,95z+0,002y
d) 9m+7n-6k+4-2m+6n+2,5= 7m+13n-6k+6,5
e) 1,05s+2,94y-0,09s+7,06y+2,03b= 0,96s+10y+2,03b
f) 0,8a+1,2a+0,4b-2a-0,4b= 0