0.05+0.1(100-a)=-25

Solution for 0.05+0.1(100-a)=-25 equation:

Simplifying
0.05 + 0.1(100 + -1a) = -25
0.05 + (100 * 0.1 + -1a * 0.1) = -25
0.05 + (10 + -0.1a) = -25

Combine like terms: 0.05 + 10 = 10.05
10.05 + -0.1a = -25

Solving
10.05 + -0.1a = -25

Solving for variable 'a'.

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

Add '-10.05' to each side of the equation.
10.05 + -10.05 + -0.1a = -25 + -10.05

Combine like terms: 10.05 + -10.05 = 0.00
0.00 + -0.1a = -25 + -10.05
-0.1a = -25 + -10.05

Combine like terms: -25 + -10.05 = -35.05
-0.1a = -35.05

Divide each side by '-0.1'.
a = 350.5

Simplifying
a = 350.5