(21+X)/(56+X)=5/12的解算过程是?
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(21+X)/(56+X)=5/12的解算过程是?
(21+X)/(56+X)=5/12的解算过程是?
(21+X)/(56+X)=5/12的解算过程是?
(21+X)/(56+X)=5/12
12(21+X)=5(56+X)
12x-5x=280-252
7x=28
x=4