2x(a-b)+3y(a-b) = (2x+3y)(a-b)
X(3b-2c)-(2c-3b) = X(3b-2c) + (3b-2c) = (X+1)(3b-2c)
3(a-1)-(a-1)² = 3(a-1)-(a-1)(a-1) = (3-a+1)(a-1) =(4-a)(a-1)
2x(a-b)+3y(a-b) = (2x+3y)(a-b)
X(3b-2c)-(2c-3b) = X(3b-2c) + (3b-2c) = (X+1)(3b-2c)
3(a-1)-(a-1)² = 3(a-1)-(a-1)(a-1) = (3-a+1)(a-1) =(4-a)(a-1)