40100 - х = 3884
х = 40100 - 3884
х = 36216
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51647 + х = 80120
х = 80120 - 51647
х = 28473
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х + 27,039 = 28
х = 28 - 27,039
х = 0,961
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100,2 - х = 56,748
х = 100,2 - 56,748
х = 43,452
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12 3/4 + x = 13 5/6
x = 13 5/6 - 12 3/4
x = 13 10/12 - 12 9/12
x = 1 1/12
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x + 15/16 = 10 1/4
x = 10 1/4 - 15/16
x = 10 4/16 - 15/16
x = 9 5/16
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