Respuesta :

-4b + 5(1 -6b) = 243
-4b + 5 - 30b = 243
-34b = 243 -5
-34b = 238
-b = 7
b = -7
the answer is -7

-4b+5(1-6b)=243
-4b+5-30b=243
-34b+5=243
-34b=238
-b=7
b=-7