помогите очень надо 2x+3=3x-7 9x-2=5x-2 10-3x=2x-15
2x + 3 = 3x - 7 3x - 2x = 3 + 7 x = 10 -------------------- 9x - 2 = 5x - 2 9x - 5x = - 2 + 2 4x = 0 x = 0 ----------------------- 10 - 3x = 2x - 15 2x + 3x = 10 + 15 5x = 25 x = 25 : 5 x = 5
спасибо
большое