x+3x+4=20

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Solution for x+3x+4=20 equation: 


Simplifying
x + 3x + 4 = 20

Reorder the terms:
4 + x + 3x = 20

Combine like terms: x + 3x = 4x
4 + 4x = 20

Solving
4 + 4x = 20

Solving for variable 'x'.

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

Add '-4' to each side of the equation.
4 + -4 + 4x = 20 + -4

Combine like terms: 4 + -4 = 0
0 + 4x = 20 + -4
4x = 20 + -4

Combine like terms: 20 + -4 = 16
4x = 16

Divide each side by '4'.
x = 4

Simplifying
x = 4

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