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(7 * 4 - 9y)/63 = - 1/10
(28 - 9y)/63 = - 1/10
10 (28 - 9y) = 63 (- 1)
280 - 90y = - 63
- 90y = - 63 - 280
- 90y = - 343
y = - 343/-90
y = 343/90--------Respuesta