0,3*(5-x)-1,3=0,4*(3x+8)

Solve the equation (using comma as decimal separator):

0,3*(5 - x) - 1,3 = 0,4*(3x + 8)

Expand:

• Left: 0,35 = 1,5 and 0,3(-x) = -0,3x, so left = 1,5 - 0,3x - 1,3 = 0,2 - 0,3x
• Right: 0,4*(3x + 8) = 1,2x + 3,2

So 0,2 - 0,3x = 1,2x + 3,2

Solve: 0,2 = 1,5x + 3,2 -3,0 = 1,5x x = -3,0 / 1,5 = -2

Check (optional): substitute x = -2 gives both sides 0,8.

Answer: x = -2.