Answer:
3
Explanation:
move 15 to the other side of the equation so, -b=15-12 then, -b=-3 and two negatives make a postive so b=3
To solve the equation, subtract 15 from both sides
-b = -3
Since both sides are negative, we can just take away the negative signs.
b = 3
3.4m questions
4.4m answers