Question

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Answer 1

3)
-z+7= -8
subtract 7 from each side to then get -z= -15
If you need a positive number for z multiply each side by -1

4)
$\frac{w}{-9} +7=10$
subtract 7 from each side to get $\frac{w}{-9} =10$
Then multiply each side by -9 to get W= -90

5)
25=8+$\frac{n}{2}$
first subtract 8 from each side to get 25=$\frac{n}{2}$
Now multiply each side by 2 to get 50=n

6)
$\frac{y-8}{3} =-7$
first multiply each side by three to get y-8= -21
add 8 to each side y= -13

Hope I helped :)