Respuesta :
0.75(8b+4)-1=4b+140
6b+3-1=4b+140
6b+2=4b+140
6b+2-2=4b+140-2
6b=4b+138
6b-4b=4b-4b+138
2b=138
2b/2=138/2
B=69
6b+3-1=4b+140
6b+2=4b+140
6b+2-2=4b+140-2
6b=4b+138
6b-4b=4b-4b+138
2b=138
2b/2=138/2
B=69