yng nomer 3 ABC yaa,bntu sekarang

A.
7x + 4 = 2x - 16
7x - 2x = -16 - 4
5x = -20
x = -4

B.
9 + 4a= a + 18
4a - a = 18 -9
3a = 9
a = 3

C.
1/3x + 5 = x + 2
1/3x + x = 2 - 5
-2/3x = -3
x = 10,5

D.
2/3 (k - 1) = 1/2k + 5
→ 2/3k - 2/3 = 1/2k + 5
→ (6).2/3k - (6).2/3 = (6).1/2 + (6).5
→ 4k - 4 = 3k + 30
→ 4k - 3k = 30 + 4
→ k = 34

Maaf kalo seandainya jawabannya salah ^_^

A. 7x + 4 = 2x - 16
7x - 2x = -16 - 4
5x = -20
x = -4

B. 9 + 4a = a + 18
4a - a = 18 - 9
3a = 9
a = 3

C. 1/3x + 5 = x + 2
1/3x - x = 2 - 5
1/3x - x = -3
x - 3x = -9 (kedua ruas dikali 3)
-2x = -9
x = 9/2
D. 2/3 (k - 1) = 1/2k + 5 2/3k - 2/3 = 1/2k + 5 2/3k - 1/2k = 5 + 2/3 4/6k - 3/6k = 5 + 2/3 1/6k = 5 + 2/3 (kedua ruas kali 6) k = 30 + 4 k = 34