5.4x - 4.1x - 2.5 = 6.5 - 0.2x
1.3x - 2.5 = 6.5 - 0.2x
Add 0.2x to both sides:
1.5x - 2.5 = 6.5
Add 2.5 to both sides:
1.5x = 9
Divide by 1.5:
x = 6