First u use distrubutive property so the 5 to n and -7 and the 9 to the 1 and 10n now u have 5n-35+9+90n that’s a big woppin number on then u do -35+9=-26 so now ur equation is 5n-26+90n than take 5n+90n for 95n so it’s -26+95n (idk if ur solving for n or just want the answer like that annywhoo) I hope u pass