tolong jawab ya yang di lingakari.

(11) 1, 2, dan 3 (A)

(13) 6 + 3x = 18
3x = 18 – 6
3x = 12
x = 4 (A)

(14) 2x + 3 = 3x + 7
2x – 3x = 7 – 3
–x = 4
x = –4 (B)

(15) 7x –4 = 4x + 20
7x – 4x = 20 + 4
3x = 24
x = 8 (D)

(18) lebar = x
panjang = x + 5
keliling = y
y = 2(x + x + 5)
y = 2(2x +5)
y = 4x + 10 (B)