3y (2-x)-5x(1-y) = 6y - 3xy - 5x +5xy = 6y - 5x - 2xy
3y(2-x)-5x(1-y) = 6y - 3xy - 5x +5xy = 6y - 5x + 2xy
3y (2-x)-5x(1-y) = 6y - 3xy - 5x +5xy = 6y - 5x - 2xy
3y(2-x)-5x(1-y) = 6y - 3xy - 5x +5xy = 6y - 5x + 2xy