B. 5(3x – 2) + 2(2x + 5) = 5(3x – 8) – 9​

5(3x – 2) + 2(2x + 5) = 5(3x – 8) – 9

» 15x – 10 + 4x + 10 = 15x – 40 – 9

»15x + 4x – 10 + 10 = 15x – 40 – 9

» 19x = 15x – 40 – 9

» 19x – 15x = -40 – 9

» 4x = -49

» x = -49/4

5(3x – 2) + 2(2x + 5) = 5(3x – 8) – 9

15x – 10 + 4x + 10 = 15x – 40 – 9

19x = 15x – 49

19x – 15x = – 49

4x = – 49

x = – 49/4

x = – 12 1/4

jadi, x = -12 1/4