X-(-3x)=7+x

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Solution for X-(-3x)=7+x equation: 


Simplifying
X + -1(-3x) = 7 + x

Remove parenthesis around (-3x)
X + -1 * -3x = 7 + x

Multiply -1 * -3
X + 3x = 7 + x

Solving
X + 3x = 7 + x

Solving for variable 'X'.

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

Add '-3x' to each side of the equation.
X + 3x + -3x = 7 + x + -3x

Combine like terms: 3x + -3x = 0
X + 0 = 7 + x + -3x
X = 7 + x + -3x

Combine like terms: x + -3x = -2x
X = 7 + -2x

Simplifying
X = 7 + -2x

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