7-3b = 5b+15 solve the equation

7-3b = 5b+15

move 5b to the other side

sign changes from + 5b to - 5b

7-3b-5b=5b-5b+15 (combine like terms)

7-3b-5b=15

7-8b=15

move 7 to the other side

7-7-8b=15-7

-8b=15-7

-8b=8

divide both sides by - 8

to get + b and by itself

-8b/-8=8/-8

Answer:

b=-1

b=-1

Step-by-step explanation:

we have isolate variable on one side and number on other

so we move 5b to the right side and it becomes negative and we move 7 to the left and it becomes negative

-3b-5b=15-7

-8b = 8

__ __ (you divided - 8 by - 8b to isolate b and by the other side)

-8 - 8

b = - 1