Okay so first let’s bring the variables to one side and the constants on the other side of the equal sign. (Remember that the sign changes for every coefficient/variable/constant.):
3b + b = -5 + 1 + 12
Add like terms:
4b = 8
Now you have to both sides by 4 considering that’s the biggest number 4 and 8 are divisible by:
b = 2
Your solution is b = 2
