21-13=4(x-9)

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Solution for 21-13=4(x-9) equation:


Simplifying
21 + -13 = 4(x + -9)

Combine like terms: 21 + -13 = 8
8 = 4(x + -9)

Reorder the terms:
8 = 4(-9 + x)
8 = (-9 * 4 + x * 4)
8 = (-36 + 4x)

Solving
8 = -36 + 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.
8 + -4x = -36 + 4x + -4x

Combine like terms: 4x + -4x = 0
8 + -4x = -36 + 0
8 + -4x = -36

Add '-8' to each side of the equation.
8 + -8 + -4x = -36 + -8

Combine like terms: 8 + -8 = 0
0 + -4x = -36 + -8
-4x = -36 + -8

Combine like terms: -36 + -8 = -44
-4x = -44

Divide each side by '-4'.
x = 11

Simplifying
x = 11

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