Question

x + x - (-15) = 25 - (-15)

Answer 1

x + x - (-15) = 25 - (-15)

2x + 15 = 25 + 15

2x + 15 = 40

2x = 40 - 15

2x = 25

x = 12,5

Vậy x = 12,5

Answer 2

\(x+x-\left(-15\right)=25-\left(-15\right)\)

\(\Rightarrow x+x=25\)

\(\Rightarrow2x=25\)

\(\Rightarrow x=12,5\)