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a) 3a +..... a = 7a

b) 2b + .... b = 3b

c) 4x + 13x = ...... x

d) 5a + ...... a - 2b + ...... b = a + b

e) 12d - ..... d = -2

f) 6x + ..... x + 2y - 7y = 10x - y

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