решите пожалуйста. примеры. за 6класс.

-27+68-56+61=

4,17-9,42+0,2=

3,1+(-4,72)+(-8,44)-(31,67)=

. решите уравнение
-7,6-x+5,9+8,1+x=

6,8+x+y-14,9-y​
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