-12d - 9= 15d+9
-12d - 9= 15d+9
-12d + (-15d) = 9 + 9
-27d = 18
d = -18/27
d = - 0.67
having problems with formulas, can you explain how you answered this problem ty
To solve the equation -12d - 9 = 15d + 9, we need to isolate the variable "d" on one side of the equation.
Step 1: Combine like terms:
Let's begin by adding 12d to both sides of the equation to eliminate the -12d on the left side:
-12d + 12d - 9 = 15d + 12d + 9
Simplifying this equation gives:
-9 = 27d + 9
Step 2: Simplify further:
Next, subtract 9 from both sides of the equation to isolate the term with "d":
-9 - 9 = 27d + 9 - 9
This simplifies to:
-18 = 27d
Step 3: Solve for "d":
To find the value of "d," we divide both sides of the equation by 27:
-18/27 = 27d/27
Simplifying gives:
-2/3 = d
Therefore, the solution to the equation -12d - 9 = 15d + 9 is d = -2/3.