15*0.40+x*0.60=6

Solution for 15*0.40+x*0.60=6 equation:

Simplifying
15 * 0.40 + x * 0.60 = 6

Multiply 15 * 0.40
6 + x * 0.60 = 6

Reorder the terms for easier multiplication:
6 + 0.60x = 6

Add '-6' to each side of the equation.
6 + -6 + 0.60x = 6 + -6

Combine like terms: 6 + -6 = 0
0 + 0.60x = 6 + -6
0.60x = 6 + -6

Combine like terms: 6 + -6 = 0
0.60x = 0

Solving
0.60x = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '0.60'.
x = 0

Simplifying
x = 0