Tentukan hasil pengurangan aljabar berikut a(42n+35m+7)-(-50m-20n+9) B(5x+3)-(x-1) C(2y+5z)-(4y-8)

A. ( 42n +35m +7) - (-50m -20n +9)
= 42n +35m +7 + 59m + 20n - 9
= 35m +59m +42n +20n +7 -9
= 94m +62n -2

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

C. (2y +5z) - (4y -8)
= 2y +5z -4y +8
= 2y -4y +5z +8
= -2y +5z +8