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(2b + 10)/5 = (- 13b + 30)/5
5 (2b + 10) = 5 (- 13b + 30)
10b + 50 = - 65b + 150
10b + 65b = 150 - 50
75b = 100
b = 100/75
b = 4/3
El valor de b es 4/3