15.61-(.4+3.5)=x

Solution for 15.61-(.4+3.5)=x equation:

Simplifying
15.61 + -1(0.4 + 3.5) = x

Combine like terms: 0.4 + 3.5 = 3.9
15.61 + -1(3.9) = x

Multiply -1 * 3.9
15.61 + -3.9 = x

Combine like terms: 15.61 + -3.9 = 11.71
11.71 = x

Solving
11.71 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
11.71 + -1x = x + -1x

Combine like terms: x + -1x = 0
11.71 + -1x = 0

Add '-11.71' to each side of the equation.
11.71 + -11.71 + -1x = 0 + -11.71

Combine like terms: 11.71 + -11.71 = 0.00
0.00 + -1x = 0 + -11.71
-1x = 0 + -11.71

Combine like terms: 0 + -11.71 = -11.71
-1x = -11.71

Divide each side by '-1'.
x = 11.71

Simplifying
x = 11.71