X-(.3x+.4x)=120

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Solution for X-(.3x+.4x)=120 equation: 


Simplifying
X + -1(0.3x + 0.4x) = 120

Combine like terms: 0.3x + 0.4x = 0.7x
X + -1(0.7x) = 120

Remove parenthesis around (0.7x)
X + -1 * 0.7x = 120

Multiply -1 * 0.7
X + -0.7x = 120

Solving
X + -0.7x = 120

Solving for variable 'X'.

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

Add '0.7x' to each side of the equation.
X + -0.7x + 0.7x = 120 + 0.7x

Combine like terms: -0.7x + 0.7x = 0.0
X + 0.0 = 120 + 0.7x
X = 120 + 0.7x

Simplifying
X = 120 + 0.7x

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