20=18-X

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Solution for 20=18-X equation:


Simplifying
20 = 18 + -1X

Solving
20 = 18 + -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.
20 + X = 18 + -1X + X

Combine like terms: -1X + X = 0
20 + X = 18 + 0
20 + X = 18

Add '-20' to each side of the equation.
20 + -20 + X = 18 + -20

Combine like terms: 20 + -20 = 0
0 + X = 18 + -20
X = 18 + -20

Combine like terms: 18 + -20 = -2
X = -2

Simplifying
X = -2

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