упростите выражение
a) 18x-3x+5x
б)2y-9y
в)1,2c-0,3c+5
г)2a-15-a+6
д)t+6,3t-2,1t
е)5x-5+3x-4x
ж)-a-a-a-a
з)-2n-2n-2n
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