You would have 30 coins, 6 dimes, 4 nickels, and 20 pennies.
Add 5/7 on both sides.
It'll cancel out the negative 5/7, and it will make the x variable only equal to one number (Well, a mixed number.)
4*0.79+2*3.99+12.18+3*4.12 =35.68
including tax it's 35.68+ 8%of 35.68=35.68 +(8*35.68/100)=35.68+2.8544=38.5344$
X+10=7x
10=6x
10/6=x
1 4/6 = x
1 2/3 =x
Hope this helps :)
