21x+4=25x-20

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Solution for 21x+4=25x-20 equation:


Simplifying
21x + 4 = 25x + -20

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

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

Solving
4 + 21x = -20 + 25x

Solving for variable 'x'.

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

Add '-25x' to each side of the equation.
4 + 21x + -25x = -20 + 25x + -25x

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

Combine like terms: 25x + -25x = 0
4 + -4x = -20 + 0
4 + -4x = -20

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

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

Combine like terms: -20 + -4 = -24
-4x = -24

Divide each side by '-4'.
x = 6

Simplifying
x = 6

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