A: 0.25[2.5x + 1.5(x – 4)] = –x.
x = 0.75
Multiply both sides by 4
2.5x +1.5(x - 4) = -4x
Multiply the bracketed term by 1.5
2.5x + 1.5x - 1.5*4 = -4x
Simplify the left-hand side
4x - 6 = -4x
Add 4x to both sides
8x - 6 = 0
Add 6 to both sides
8x = 6
Divide both sides by 8
x = 6/8
Simplify
x = 3/4 (or x = 0.75)