How do i factor -1/2 out of -1/2x + 6

Jamie went to home depot. she bought 25 bags of soil that cost $9 per bag. she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each. she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

How do you write y-10=2 (x-8) in standard form

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top