X-10=20-X

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Solution for X-10=20-X equation:


Simplifying
X + -10 = 20 + -1X

Reorder the terms:
-10 + X = 20 + -1X

Solving
-10 + X = 20 + -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.
-10 + X + X = 20 + -1X + X

Combine like terms: X + X = 2X
-10 + 2X = 20 + -1X + X

Combine like terms: -1X + X = 0
-10 + 2X = 20 + 0
-10 + 2X = 20

Add '10' to each side of the equation.
-10 + 10 + 2X = 20 + 10

Combine like terms: -10 + 10 = 0
0 + 2X = 20 + 10
2X = 20 + 10

Combine like terms: 20 + 10 = 30
2X = 30

Divide each side by '2'.
X = 15

Simplifying
X = 15

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