80-x-x-3x=100

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Solution for 80-x-x-3x=100 equation:


Simplifying
80 + -1x + -1x + -3x = 100

Combine like terms: -1x + -1x = -2x
80 + -2x + -3x = 100

Combine like terms: -2x + -3x = -5x
80 + -5x = 100

Solving
80 + -5x = 100

Solving for variable 'x'.

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

Add '-80' to each side of the equation.
80 + -80 + -5x = 100 + -80

Combine like terms: 80 + -80 = 0
0 + -5x = 100 + -80
-5x = 100 + -80

Combine like terms: 100 + -80 = 20
-5x = 20

Divide each side by '-5'.
x = -4

Simplifying
x = -4

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