100a+4(1a-20)=

Solution for 100a+4(1a-20)= equation:

Simplifying
100a + 4(1a + -20) = 0

Reorder the terms:
100a + 4(-20 + 1a) = 0
100a + (-20 * 4 + 1a * 4) = 0
100a + (-80 + 4a) = 0

Reorder the terms:
-80 + 100a + 4a = 0

Combine like terms: 100a + 4a = 104a
-80 + 104a = 0

Solving
-80 + 104a = 0

Solving for variable 'a'.

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

Add '80' to each side of the equation.
-80 + 80 + 104a = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 104a = 0 + 80
104a = 0 + 80

Combine like terms: 0 + 80 = 80
104a = 80

Divide each side by '104'.
a = 0.7692307692

Simplifying
a = 0.7692307692