Isolate the x. Note the equal sign. What you do to one side, you do to the other.
First, multiply 2 to both sides
(2x - 8.6)/2(2) = -2.3(2)
2x - 8.6 = -4.6
Isolate the x. First, add 8.6 to both sides
2x - 8.6 (+8.6) = -4.6 (+8.6)
2x = -4.6 + 8.6
2x = 4
Next, to isolate the x, divide 2 from both sides
2x/2 = 4/2
x = 4/2
x = 2
2 is your answer for x
~Rise Above the Ordinary