100=.4x+.8x

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Solution for 100=.4x+.8x equation:


Simplifying
100 = 0.4x + 0.8x

Combine like terms: 0.4x + 0.8x = 1.2x
100 = 1.2x

Solving
100 = 1.2x

Solving for variable 'x'.

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

Add '-1.2x' to each side of the equation.
100 + -1.2x = 1.2x + -1.2x

Combine like terms: 1.2x + -1.2x = 0.0
100 + -1.2x = 0.0

Add '-100' to each side of the equation.
100 + -100 + -1.2x = 0.0 + -100

Combine like terms: 100 + -100 = 0
0 + -1.2x = 0.0 + -100
-1.2x = 0.0 + -100

Combine like terms: 0.0 + -100 = -100
-1.2x = -100

Divide each side by '-1.2'.
x = 83.33333333

Simplifying
x = 83.33333333

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