раскройте скобки и упростите выражения. (полное решение)

1. а) 2x-(2x+y)+y     б) -a+(2a-b)+2b    в) 7-(b+14)-2b    г) 3b-(18+b)+8

2.  а) 2(3-x)-(8+x)    б) -4(y+5)+(12-y)   в) -(7-x)+4(x-5)    г)-9(y-4)-(12+y)

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