5x+21=4x+20

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Solution for 5x+21=4x+20 equation:


Simplifying
5x + 21 = 4x + 20

Reorder the terms:
21 + 5x = 4x + 20

Reorder the terms:
21 + 5x = 20 + 4x

Solving
21 + 5x = 20 + 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.
21 + 5x + -4x = 20 + 4x + -4x

Combine like terms: 5x + -4x = 1x
21 + 1x = 20 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + 1x = 20 + 0
21 + 1x = 20

Add '-21' to each side of the equation.
21 + -21 + 1x = 20 + -21

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

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

Divide each side by '1'.
x = -1

Simplifying
x = -1

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