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3*(x + 6 7/12) = -25 3/4
3*(x + 79/12) = -103/4
x + 79/12 = -103/4 : 3
x + 79/12 = -103/12
x = -103/12 - 79/12 = -182/12 = -91/5 = - 18 целых 1/5