This is a bit confusing, double check if you typed everything correctly.

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Explanation:</h2><h2 />
Here we have the following equation:

So let's follows these steps:
Step 1: Add 3x to both sides:

Step 2. Combine like terms:

Step 3. Subtract -1 from both sides:

Step 4. Divide both sides by 35:

<h2>Learn more:</h2>
Solving equations by graph: brainly.com/question/10643312
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Since there is 16 cups in a US gallon, and there is 7 days in a week. First, you would multiply 1.5 times 7 getting 10.5 cups. But since that is not enough cups to be a gallon the division equation would look like this, 10.5/16 = ?. You can simplify it down to 5.25/8. Then, you get your answer of 0.65625 gallons.