500-4a=100

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Solution for 500-4a=100 equation: 


Simplifying
500 + -4a = 100

Solving
500 + -4a = 100

Solving for variable 'a'.

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

Add '-500' to each side of the equation.
500 + -500 + -4a = 100 + -500

Combine like terms: 500 + -500 = 0
0 + -4a = 100 + -500
-4a = 100 + -500

Combine like terms: 100 + -500 = -400
-4a = -400

Divide each side by '-4'.
a = 100

Simplifying
a = 100

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