The answer is 8/25
Hope it helped
Assignment: 
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Answer: 
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Explanation: 
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[ Step One ] Subtract 12 From Both Sides

[ Step Two ] Simplify

[ Step Three ] Subtract 8x From Both Sides

[ Step Four ] Simplify

[ Step Five ] Divide Both Sides By 3

[ Step Six ] Simplify

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I’d assume image 1 since it’s a combination of multiple substances or a mixture.
The answer is D that’s just yea cuz 25-25% is 18.75 and that times 3 is d