Упростите:

a) 18x-3x+5x

б) 2y-9y

в) 1.2c-0.3c+5

г) 2a-15-a+6

д) t+ 6.3t-2.1t

e) 5x-5+3x-4x

ж) -a-a-a-a

з) -2n-2n-2n

и) 1/3x+1/3x+1/3x

/-дробная черта

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