5(x+1) - 13 >= 7x + 20
5x + 5 - 13 >= 7x + 20
5x - 8 >= 7x + 20
Subtract 5x from both sides:
-8 >= 2x + 20
Subtract 20 from both sides:
-28 >= 2x
Divide by 2:
-14 >= x
Ответ: x <= -14.
5(x+1) - 13 >= 7x + 20
5x + 5 - 13 >= 7x + 20
5x - 8 >= 7x + 20
Subtract 5x from both sides:
-8 >= 2x + 20
Subtract 20 from both sides:
-28 >= 2x
Divide by 2:
-14 >= x
Ответ: x <= -14.