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