21x-25=20x-45

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Solution for 21x-25=20x-45 equation:


Simplifying
21x + -25 = 20x + -45

Reorder the terms:
-25 + 21x = 20x + -45

Reorder the terms:
-25 + 21x = -45 + 20x

Solving
-25 + 21x = -45 + 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.
-25 + 21x + -20x = -45 + 20x + -20x

Combine like terms: 21x + -20x = 1x
-25 + 1x = -45 + 20x + -20x

Combine like terms: 20x + -20x = 0
-25 + 1x = -45 + 0
-25 + 1x = -45

Add '25' to each side of the equation.
-25 + 25 + 1x = -45 + 25

Combine like terms: -25 + 25 = 0
0 + 1x = -45 + 25
1x = -45 + 25

Combine like terms: -45 + 25 = -20
1x = -20

Divide each side by '1'.
x = -20

Simplifying
x = -20

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