x+3x=12+8

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Solution for x+3x=12+8 equation: 


Simplifying
x + 3x = 12 + 8

Combine like terms: x + 3x = 4x
4x = 12 + 8

Combine like terms: 12 + 8 = 20
4x = 20

Solving
4x = 20

Solving for variable 'x'.

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

Divide each side by '4'.
x = 5

Simplifying
x = 5

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