400-20x=100+30x

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Solution for 400-20x=100+30x equation:


Simplifying
400 + -20x = 100 + 30x

Solving
400 + -20x = 100 + 30x

Solving for variable 'x'.

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

Add '-30x' to each side of the equation.
400 + -20x + -30x = 100 + 30x + -30x

Combine like terms: -20x + -30x = -50x
400 + -50x = 100 + 30x + -30x

Combine like terms: 30x + -30x = 0
400 + -50x = 100 + 0
400 + -50x = 100

Add '-400' to each side of the equation.
400 + -400 + -50x = 100 + -400

Combine like terms: 400 + -400 = 0
0 + -50x = 100 + -400
-50x = 100 + -400

Combine like terms: 100 + -400 = -300
-50x = -300

Divide each side by '-50'.
x = 6

Simplifying
x = 6

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