Decompose the two numbers A and B into prime factors: A number = 2*3*A; B number = 2*5*A. It is known that the least common multiple of two numbers A and B is 210, A=what.
把甲乙两数分解质因数：甲数=2*3*A；乙数=2*5*A．已知甲乙两数的最小公倍数是210，A=多少．
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