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(5y - 6)/2 = - y - 9
5y - 6 = 2 (- y - 9)
5y - 6 = - 2y - 18
5y + 2y = - 18 + 6
7y = - 12
y = - 12/7
El valor de y es - 12/7
1/2(5y-6)=-y-9
5/2y-3=-y-9
5/2y+y=-9+3
(5y+2y)/2=-6
5y+2y=-12
7y=-12
y=-12/7
saludos