(x+2)+x=9 x+(7+x)=11 x+2x-5=40 x+(4+x)+x=16

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вопрос

Let's solve each equation step by step:

1) (x+2) + x = 9
x + 2 + x = 9
2x + 2 = 9
2x = 7
x = 7/2
x = 3.5

2) x + (7 + x) = 11
x + 7 + x = 11
2x + 7 = 11
2x = 4
x = 2

3) x + 2x - 5 = 40
3x - 5 = 40
3x = 45
x = 15

4) x + (4 + x) + x = 16
x + 4 + x + x = 16
3x + 4 = 16
3x = 12
x = 4

Therefore, the solutions for each equation are:
1) x = 3.5
2) x = 2
3) x = 15
4) x = 4