20-7=X

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Solution for 20-7=X equation:


Simplifying
20 + -7 = X

Combine like terms: 20 + -7 = 13
13 = X

Solving
13 = X

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
13 + -1X = X + -1X

Combine like terms: X + -1X = 0
13 + -1X = 0

Add '-13' to each side of the equation.
13 + -13 + -1X = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -1X = 0 + -13
-1X = 0 + -13

Combine like terms: 0 + -13 = -13
-1X = -13

Divide each side by '-1'.
X = 13

Simplifying
X = 13

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