1 4 9 10y 3 5y 7 8 July 8, 2019 16 32 64 128 1 4 9 10y 3 5y 7 8 simplified 1 4 9 10y − 3 5y 7 8 4 5(-8y - 7) - 3 9(6 - 9y) = 4y+7y+1 8=9 5
