13=0.5(X+21)

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Solution for 13=0.5(X+21) equation:


Simplifying
13 = 0.5(X + 21)

Reorder the terms:
13 = 0.5(21 + X)
13 = (21 * 0.5 + X * 0.5)
13 = (10.5 + 0.5X)

Solving
13 = 10.5 + 0.5X

Solving for variable 'X'.

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

Add '-0.5X' to each side of the equation.
13 + -0.5X = 10.5 + 0.5X + -0.5X

Combine like terms: 0.5X + -0.5X = 0.0
13 + -0.5X = 10.5 + 0.0
13 + -0.5X = 10.5

Add '-13' to each side of the equation.
13 + -13 + -0.5X = 10.5 + -13

Combine like terms: 13 + -13 = 0
0 + -0.5X = 10.5 + -13
-0.5X = 10.5 + -13

Combine like terms: 10.5 + -13 = -2.5
-0.5X = -2.5

Divide each side by '-0.5'.
X = 5

Simplifying
X = 5

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