-2x=(-7,5)+(-2,5)
-2x=-10
x =-10:(-2)
x =5
Vậy x=5
\(\left(-2x\right)-\left(-2,5\right)=-7,5\)
\(-2x+2,5=-7,5\)
\(-2x=-10\)
\(x=5\)
-2x - (-2,5) = -7,5
=> -2x + 2,5 = -7,5
=> -2x = -7,5 - 2,5
=> -2x = -10
=> x = \(\frac{-10}{-2}\)
=> x = 5
Vậy x = 5