Answer: d
Step-by-step explanation:
X=15
expand the brackets and collect like terms so 6x+15=7x
then -6x to get x=15
Answer is D) 2/3 because you divide the whole equation by 3 scene as 2cups=3gal. In order to get one gal, you need to divide the right side by 3 to make one and what you do to one side of an equation, you must do to the other.