Решите уравнения : а) х + 11/43 = 9/12; б) 21/34 - у = 16/51; в) 21/78 - а = 4/39; г) х + 36/155 = 45/62; д) 77/89 + у = 173/178; е) 19/21 - а = 14/210

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вопрос

а) x = 9/12 - 11/43
x = 129/172 - 11/43
x = 129/172 - 68/172
x = 61/172

б) 21/34 - у = 16/51
-y = 16/51 - 21/34
-y = 32/102 - 66/102
-y = -34/102
y = 34/102
y = 17/51

в) 21/78 - a = 4/39
-a = 4/39 - 21/78
-a = 104/1014 - 429/1014
-a = -325/1014
a = 325/1014

г) x + 36/155 = 45/62
x = 45/62 - 36/155
x = 450/620 - 372/620
x = 78/620
x = 39/310

д) 77/89 + y = 173/178
y = 173/178 - 77/89
y = 173/178 - 1742/178
y = -1569/178
y = -873/89

е) 19/21 - a = 14/210
-a = 14/210 - 19/21
-a = 28/420 - 399/420
-a = -371/420
a = 371/420