0.9*(4.1+x)=4

Solution for 0.9*(4.1+x)=4 equation:

Simplifying
0.9(4.1 + x) = 4
(4.1 * 0.9 + x * 0.9) = 4
(3.69 + 0.9x) = 4

Solving
3.69 + 0.9x = 4

Solving for variable 'x'.

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

Add '-3.69' to each side of the equation.
3.69 + -3.69 + 0.9x = 4 + -3.69

Combine like terms: 3.69 + -3.69 = 0.00
0.00 + 0.9x = 4 + -3.69
0.9x = 4 + -3.69

Combine like terms: 4 + -3.69 = 0.31
0.9x = 0.31

Divide each side by '0.9'.
x = 0.3444444444

Simplifying
x = 0.3444444444