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(m(3n+5)) - (2 - 10m + 15 mn) = 3mn + 5m - 2 + 10m - 15mn
= -12mn + 15m - 2
2)
(3p - 2q + 7r) - (10r + 3q + 15p) = 3p - 2q + 7r - 10r - 3q - 15p
= -12p -5q -3r
3)
(x + 2y - z) + (2x -y + 3z) = x + 2y - z + 2x -y + 3z
= 3x + y +2z
= 3mn + 5m -2 + 10m - 15mn
= 3mn - 15mn + 5m + 10m - 2
= -12mn + 15m - 2
2.(3p-2q+7r) - (10r+3q+15p)
= 3p - 2q + 7r - 10r - 3q - 15p
= 3p - 15p - 2q - 3q + 7r - 10r
= -12p -5q - 3r
3.(x+2y-z) + (2x-y+3z)
= x + 2y - z + 2x -y + 3z
= x + 2x + 2y - y - z + 3z
= 3x + y + 2z