x+3x=7-x

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Solution for x+3x=7-x equation: 


Simplifying
x + 3x = 7 + -1x

Combine like terms: x + 3x = 4x
4x = 7 + -1x

Solving
4x = 7 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
4x + x = 7 + -1x + x

Combine like terms: 4x + x = 5x
5x = 7 + -1x + x

Combine like terms: -1x + x = 0
5x = 7 + 0
5x = 7

Divide each side by '5'.
x = 1.4

Simplifying
x = 1.4

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