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

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


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

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

Reorder the terms:
-21 + 21x = 5(5 + 4x) + -4
-21 + 21x = (5 * 5 + 4x * 5) + -4
-21 + 21x = (25 + 20x) + -4

Reorder the terms:
-21 + 21x = 25 + -4 + 20x

Combine like terms: 25 + -4 = 21
-21 + 21x = 21 + 20x

Solving
-21 + 21x = 21 + 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 + 21x + -20x = 21 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-21 + 1x = 21 + 20x + -20x

Combine like terms: 20x + -20x = 0
-21 + 1x = 21 + 0
-21 + 1x = 21

Add '21' to each side of the equation.
-21 + 21 + 1x = 21 + 21

Combine like terms: -21 + 21 = 0
0 + 1x = 21 + 21
1x = 21 + 21

Combine like terms: 21 + 21 = 42
1x = 42

Divide each side by '1'.
x = 42

Simplifying
x = 42

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