Упростите выражения:
6d-(d+9)+(5d-1)
4·(2a-c)-5·(a+3c)
2·(5m+n)+5·(n-2m)
11n-(7n-1)-6n+8
x(y+z)-y(x+z)-z(x-y)
6d-(d+9)+(5d-1)
4·(2a-c)-5·(a+3c)
2·(5m+n)+5·(n-2m)
11n-(7n-1)-6n+8
x(y+z)-y(x+z)-z(x-y)
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