ساده کنید. $(-12)x + 15y + 17x + y =$ $3(4a + 3b) - 6(2a + 5b) =$ $-(-3a) + (-7b) - (-8a) + 7b =$ $-6a + 7b - 2(3a + b) =$ $9(x - x.x + 1) + 6x(2x - 5) + 16 =$ $8(a - 3y) + 4(-2a + 5y) =$ $3p - (-5)p + 7t - 6t + 5t - 14 + 9 =$ $3(x - 2y) - x + 6y =$