we have: SM = TM
So: 2x + 3 = 4x - 7
=> 2x - 4x = -7 - 3
=> - 2x = - 10
=> x = (-10) / (-2) = 5
=> SM = 2 × 5 + 3 = 10 + 3 = 13
Answer: 13
Ok done. Thank to me :>
