1) (4m+n)-(3m-n) = 4m + n - 3m + n = (4m - 3m) + (n + n) = m + 2n
2) 8(x-0,5)-(3+9x) = 8x - 4 - 3 - 9x = (8x - 9x) + (-4 - 3) = -x - 7
1) (4m+n)-(3m-n) = 4m + n - 3m + n = (4m - 3m) + (n + n) = m + 2n
2) 8(x-0,5)-(3+9x) = 8x - 4 - 3 - 9x = (8x - 9x) + (-4 - 3) = -x - 7