Ответ:
(X-7/12)+5/12=2 1/12
X-(7/12+5/12)=2 1/12
X-2/12=2 1/12
2 1/12 + 2/12 = X
X=2 3/12
X=2 1/4
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Ответ:
(X-7/12)+5/12=2 1/12
X-(7/12+5/12)=2 1/12
X-2/12=2 1/12
2 1/12 + 2/12 = X
X=2 3/12
X=2 1/4