420-2x=300+x

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Solution for 420-2x=300+x equation:


Simplifying
420 + -2x = 300 + x

Solving
420 + -2x = 300 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
420 + -2x + -1x = 300 + x + -1x

Combine like terms: -2x + -1x = -3x
420 + -3x = 300 + x + -1x

Combine like terms: x + -1x = 0
420 + -3x = 300 + 0
420 + -3x = 300

Add '-420' to each side of the equation.
420 + -420 + -3x = 300 + -420

Combine like terms: 420 + -420 = 0
0 + -3x = 300 + -420
-3x = 300 + -420

Combine like terms: 300 + -420 = -120
-3x = -120

Divide each side by '-3'.
x = 40

Simplifying
x = 40

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