4x+21=5(4x-4)+9

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Solution for 4x+21=5(4x-4)+9 equation:


Simplifying
4x + 21 = 5(4x + -4) + 9

Reorder the terms:
21 + 4x = 5(4x + -4) + 9

Reorder the terms:
21 + 4x = 5(-4 + 4x) + 9
21 + 4x = (-4 * 5 + 4x * 5) + 9
21 + 4x = (-20 + 20x) + 9

Reorder the terms:
21 + 4x = -20 + 9 + 20x

Combine like terms: -20 + 9 = -11
21 + 4x = -11 + 20x

Solving
21 + 4x = -11 + 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
21 + 4x + -20x = -11 + 20x + -20x

Combine like terms: 4x + -20x = -16x
21 + -16x = -11 + 20x + -20x

Combine like terms: 20x + -20x = 0
21 + -16x = -11 + 0
21 + -16x = -11

Add '-21' to each side of the equation.
21 + -21 + -16x = -11 + -21

Combine like terms: 21 + -21 = 0
0 + -16x = -11 + -21
-16x = -11 + -21

Combine like terms: -11 + -21 = -32
-16x = -32

Divide each side by '-16'.
x = 2

Simplifying
x = 2

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