упростите выражение:1) 7а+8а, 2)16b-5b,    3)27с-с,  4)d+34d,   5)3х+5х+17х,   6)46у-18у+22у,   7)12а+13а+26,  8)59z-z+73,  9)38х+17х-54х+х.         заранее спасибо
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