Упростите выражения, объединяя подобные члены:
a) 21+ 3 + 51 - 1+2
b) ба + 5а — — 2а
c) 6х1 4х – 3 + 5x - 2х d) 2 +k+k
е) k+k
Г) 2 kx+/k
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