21x-20=5(4x+5)-5

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Solution for 21x-20=5(4x+5)-5 equation:


Simplifying
21x + -20 = 5(4x + 5) + -5

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

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

Reorder the terms:
-20 + 21x = 25 + -5 + 20x

Combine like terms: 25 + -5 = 20
-20 + 21x = 20 + 20x

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

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

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

Add '20' to each side of the equation.
-20 + 20 + 1x = 20 + 20

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

Combine like terms: 20 + 20 = 40
1x = 40

Divide each side by '1'.
x = 40

Simplifying
x = 40

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