7 8 y 5 6 y 10 6 3 7 July 8, 2019 16 32 64 128 8 7y-4 5y=10 5 6 7y+13+3 1y=86 5 (6y+7)/4 + (8-5y)/3=5 7 5y+(6-7 3y)-5 8
