Subtract 18 on both sides and rewrite the equation:
-8 = 4(3x+7)
Solve within parentheses:
4(3x+7)
4 x 3x = 12x
4 x 7 = 28
Rewrite the equation:
-8 = 12x + 28
Subtract 28 on both sides and rewrite the equation:
-36 = 12x
In order to determine the value of x, we’ll need to isolate the variable.
To do this, divide both sides by 12 and rewrite the equation (the value of x):
12 cancels out, similar to how 18 and 28 cancelled out earlier.
-36 divided by 12 equals -3,
So, the answer is:
x = -3
You can check your answer by substituting -3 for d in the original equation from the very beginning.
I hope this helps! :)