a+100=0.8*a

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Solution for a+100=0.8*a equation:


Simplifying
a + 100 = 0.8a

Reorder the terms:
100 + a = 0.8a

Solving
100 + a = 0.8a

Solving for variable 'a'.

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

Add '-0.8a' to each side of the equation.
100 + a + -0.8a = 0.8a + -0.8a

Combine like terms: a + -0.8a = 0.2a
100 + 0.2a = 0.8a + -0.8a

Combine like terms: 0.8a + -0.8a = 0.0
100 + 0.2a = 0.0

Add '-100' to each side of the equation.
100 + -100 + 0.2a = 0.0 + -100

Combine like terms: 100 + -100 = 0
0 + 0.2a = 0.0 + -100
0.2a = 0.0 + -100

Combine like terms: 0.0 + -100 = -100
0.2a = -100

Divide each side by '0.2'.
a = -500

Simplifying
a = -500

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