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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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a) 3a + 4a = 7a
b) 2b+1b=3b
c)4x+13x=17x
d)5a-5a-2b+1b=a+b
e) 12d-10d=-2
f) 6x+4x+2y-7y=10-y
prosze;)))