120=15-4X

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Solution for 120=15-4X equation:


Simplifying
120 = 15 + -4X

Solving
120 = 15 + -4X

Solving for variable 'X'.

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

Add '4X' to each side of the equation.
120 + 4X = 15 + -4X + 4X

Combine like terms: -4X + 4X = 0
120 + 4X = 15 + 0
120 + 4X = 15

Add '-120' to each side of the equation.
120 + -120 + 4X = 15 + -120

Combine like terms: 120 + -120 = 0
0 + 4X = 15 + -120
4X = 15 + -120

Combine like terms: 15 + -120 = -105
4X = -105

Divide each side by '4'.
X = -26.25

Simplifying
X = -26.25

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