tolonggggg........bsk di kumpul

A. (42n + 35m + 7) - (-50m-20n+9)
= 42n + 35m + 7 + 50m - 20n + 9
= 22n + 75m + 16

B. (5x + 3) - (x - 1)
= 5x + 3 - x - 1
= 5 + 2 = 7

C.
(2y + 15z) - (4y - 8)
= 2y + 15z - 4y - 8
= -2y + 15z - 8

Maaf klo salah ヾ(〃^∇^)ﾉ

a. (42n + 35m + 7) - (-50m - 20n + 9)
=42n + 35m + 7 + 50m + 20n -9
=85m + 62n -2
b. (5x + 3) - (x - 1)
=5x + 3 - x + 1
=4x +4
c. (2y + 15z) - (4y - 8)
=2y + 15z - 4y +8
= -2y + 15z + 8