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# I have to find the sum

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54
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-1/2(7z+4)+1/5(5z-15) can anyone show me how to get the answer please and thank you?

Guest Dec 17, 2017
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$$-\frac{1}{2}(7z+4)+\frac{1}{5}(5z-15)$$

First, let's use the distributive property

We get

$$-\frac{7}{2}z-2+z-3$$

I like using decimals, so this simplifies to

$$-3.5z-2+z-3$$

Now, let's just evaluate

$$-2.5z-5$$