Answer: Choice D) 
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Work Shown:

Explanation:
First I subtracted y/b from both sides. Then I multiplied both sides by 'a' to fully isolate x. You can optionally distribute the 'a' through to each term inside the parenthesis, but your teacher has chosen not to do this.
The answer is 42.8
I hope that helps<span />
The answer is definitely c
The answer is 10 u have to put 2/3 multiplied by 15/1