Solution: (3x - 5y) - (x + 2y)
=(3x - 5y)+(-x-2y)
= [3x + (-x)] + [(-5y) - 2y]
= 2x + (-7y)
=2x - 7y 1)
1) (15x - 10y ) - (2x - 5y) =
2) (a + 4b)-(-5a-4b) =
3) (6x + 4y - 1)-(-4x - 5y - 1) =
4) (4m - 1 + 3) - (2m + n-3) =
5) (x + y -- z) - (x + y - 2+5) =​