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) = 1x + 11/15 = 1x = 1 -11/15x = 1/1 - 11/15x = 4/152) 1 - y = 16/21 - 8/211 - y = 8/21-y = -13/21y = 13/213)15 - y = 1 -21/2915-y-1 = -21/2914-y=-21/2914 + 21/29 = y14/1 + 21/29 = y116/29 + 21/29 = y137/29 = yy = 4 21/29