420=3x+x

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Solution for 420=3x+x equation:


Simplifying
420 = 3x + x

Combine like terms: 3x + x = 4x
420 = 4x

Solving
420 = 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
420 + -4x = 4x + -4x

Combine like terms: 4x + -4x = 0
420 + -4x = 0

Add '-420' to each side of the equation.
420 + -420 + -4x = 0 + -420

Combine like terms: 420 + -420 = 0
0 + -4x = 0 + -420
-4x = 0 + -420

Combine like terms: 0 + -420 = -420
-4x = -420

Divide each side by '-4'.
x = 105

Simplifying
x = 105

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