100+20x=300

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Solution for 100+20x=300 equation: 


Simplifying
100 + 20x = 300

Solving
100 + 20x = 300

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + 20x = 300 + -100

Combine like terms: 100 + -100 = 0
0 + 20x = 300 + -100
20x = 300 + -100

Combine like terms: 300 + -100 = 200
20x = 200

Divide each side by '20'.
x = 10

Simplifying
x = 10

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