1.6+0.40(100-x)=50

Solution for 1.6+0.40(100-x)=50 equation:

Simplifying
1.6 + 0.40(100 + -1x) = 50
1.6 + (100 * 0.40 + -1x * 0.40) = 50
1.6 + (40 + -0.4x) = 50

Combine like terms: 1.6 + 40 = 41.6
41.6 + -0.4x = 50

Solving
41.6 + -0.4x = 50

Solving for variable 'x'.

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

Add '-41.6' to each side of the equation.
41.6 + -41.6 + -0.4x = 50 + -41.6

Combine like terms: 41.6 + -41.6 = 0.0
0.0 + -0.4x = 50 + -41.6
-0.4x = 50 + -41.6

Combine like terms: 50 + -41.6 = 8.4
-0.4x = 8.4

Divide each side by '-0.4'.
x = -21

Simplifying
x = -21