помогите решить уравнение с дробями...x+4/15 +7/15=1 1-у=16/21-8/21 15-у=1-21/29.спасибо

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1)х + (4/15 + 7/15) = 1
x + 11/15 = 1
x = 1 -11/15
x = 1/1 - 11/15
x = 4/15


2) 1 - y = 16/21 - 8/21
1 - y = 8/21
-y = -13/21
y = 13/21


3)15 - y = 1 -21/29
15-y-1 = -21/29
14-y=-21/29
14 + 21/29 = y
14/1 + 21/29 = y
116/29 + 21/29 = y
137/29 = y
y = 4 21/29