Упростите выражение: -2х+3х-5х
2а-5-а+4
Раскройте скобки: a+(-3b+2c)
-x-(-3p-2y)
-(m-2n)+(3a+b)
(x-5)-(7-x)+(9-x)
Приведите подобные: 10x-3x+x-7x ; -11 (7х-1)+4(6-4х)
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