3x+x=15+5

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Solution for 3x+x=15+5 equation: 


Simplifying
3x + x = 15 + 5

Combine like terms: 3x + x = 4x
4x = 15 + 5

Combine like terms: 15 + 5 = 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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