3+x+3x=15

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


Simplifying
3 + x + 3x = 15

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

Solving
3 + 4x = 15

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 4x = 15 + -3

Combine like terms: 3 + -3 = 0
0 + 4x = 15 + -3
4x = 15 + -3

Combine like terms: 15 + -3 = 12
4x = 12

Divide each side by '4'.
x = 3

Simplifying
x = 3

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