Приведите подобные слагаемые :а) -7x+9x-3x+2x=
б) 2b-4b+3b-11b=
в) -b+5a-7a+3b+b=
г) 9+6a-3-10a=
д) a-6a+8a=
е) 2a+3+4a-5=
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