20-3x=100

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Solution for 20-3x=100 equation: 


Simplifying
20 + -3x = 100

Solving
20 + -3x = 100

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -3x = 100 + -20

Combine like terms: 20 + -20 = 0
0 + -3x = 100 + -20
-3x = 100 + -20

Combine like terms: 100 + -20 = 80
-3x = 80

Divide each side by '-3'.
x = -26.66666667

Simplifying
x = -26.66666667

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