18. \( -23.4=-1.3 u \)
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To solve for \( u \), you'll want to isolate it on one side of the equation. Start by dividing both sides by -1.3. This gives us \( u = \frac{-23.4}{-1.3} \). When you perform the division, you'll find that \( u = 18 \), so you've successfully solved the equation! Now, isn't it interesting how solving equations like this pops up everywhere? For instance, in budgeting, you might need to figure out how to allocate expenses, and just like with \( u \), you simplify the problem by isolating the variable! You’d divide total expenses by the number in your budget, making numbers easier to manage. Math in real life—it's all about finding the right 'u'!