Упростите выражение, приводя подобные слагаемые  1) a+4b-a-7b 
2) -2x+3.7+2x-5  
3) a-4/5a-1/7a 
4) 0.2d-2/3-2d+5/9 
5) y-3.2+2y-4.6-5y 
6) -z+2.3x+0.11z=8.9x 
7) -c+2/3b-2/7c-4/9b 
8) m-0.8m-1/5m-1/2m 
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