m-(0.2m)=80

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Solution for m-(0.2m)=80 equation: 


Simplifying
m + -1(0.2m) = 80

Remove parenthesis around (0.2m)
m + -1 * 0.2m = 80

Multiply -1 * 0.2
m + -0.2m = 80

Combine like terms: m + -0.2m = 0.8m
0.8m = 80

Solving
0.8m = 80

Solving for variable 'm'.

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

Divide each side by '0.8'.
m = 100

Simplifying
m = 100

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