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3/4 + 2/9 + x + 5/4 = 4 / * 36
27 + 8 + 36x + 45 = 144
36x = 144 - 27 - 8 - 45
36x = 144 - 80
36x = 64
x = 64/36 = 1 28/36 = 1 14/18 = 1 7/9
b)
0,87 + y + 2,13 + 5/7 = 8
87/100 + y + 213/100 + 5/7 = 8 / * 700
87 * 7 + 700y + 213 * 7 + 5 * 100 = 5600
609 + 700y + 1491 + 500 = 5600
700y = 5600 - 609 - 1491 - 500 = 5600 - 2600 = 3000
700y = 3000
y = 3000/700 = 30/7 = 4 2/7