3.0*0.1+1.3*0.3+x*0.6=1.3

Solution for 3.0*0.1+1.3*0.3+x*0.6=1.3 equation:

Simplifying
3.0 * 0.1 + 1.3 * 0.3 + x * 0.6 = 1.3

Multiply 3.0 * 0.1
0.3 + 1.3 * 0.3 + x * 0.6 = 1.3

Multiply 1.3 * 0.3
0.3 + 0.39 + x * 0.6 = 1.3

Reorder the terms for easier multiplication:
0.3 + 0.39 + 0.6x = 1.3

Combine like terms: 0.3 + 0.39 = 0.69
0.69 + 0.6x = 1.3

Solving
0.69 + 0.6x = 1.3

Solving for variable 'x'.

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

Add '-0.69' to each side of the equation.
0.69 + -0.69 + 0.6x = 1.3 + -0.69

Combine like terms: 0.69 + -0.69 = 0.00
0.00 + 0.6x = 1.3 + -0.69
0.6x = 1.3 + -0.69

Combine like terms: 1.3 + -0.69 = 0.61
0.6x = 0.61

Divide each side by '0.6'.
x = 1.016666667

Simplifying
x = 1.016666667