3. 3w-(7w+12)=2(w-3)
expand
3w-7w-12=2w-6
bring all w to one side
2w-3w+7w=-12+6
6w=-6
w=-1
5. 9(n-4)-8n=32-2(n+8)
again, expand
9n-36-7n=32-2n-16
bring all n to one side
9n-7n+2n=32-16+36
4n=52
n=13
