Answer:
Step-by-step explanation:
15 - 5b = -10b - 20
15- 5b +10b = -10b +10b - 20
15 + 5b= -20
15 - 15 + 5b = -20 + -15
5b = -35
b = -7
Isolate the variable by dividing each side by factors that don't contain the variable.
