Question

2x+(5-x)=3-2x+20
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Answer 1

2x+(5-x)=3-2x+20

2x + 2x - x = 3 + 20 - 5

3x = 18

$x = \frac{18}{3}$

x = 6

Answer 2

Basta isolar a variável x, veja:

2x + (5-x) = 3 - 2x + 20
x + 5 = -2x + 23
x + 2x = 23 - 5
3x = 18
x = 18/3
x = 6