Temukan hasil pengurangan bentuk aljabar berikut a. (42n + 35m + 7) - (-50m - 20n + 9)= b. (5x + 3) - (x - 1)= c. (2y + 15z) - (4y - 8)

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

a). (42n + 35m + 7) - (-50m - 20n + 9)
= (42 - -20)n + (35 - -50)m + (7 - 9)
= 62n + 85m - 2

b). (5x + 3) - (x - 1)
= (5 - 1)x + (3 - -1)
= 4x + 4

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

semofa membantu:)