9x-51=5x+21

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Solution for 9x-51=5x+21 equation:


Simplifying
9x + -51 = 5x + 21

Reorder the terms:
-51 + 9x = 5x + 21

Reorder the terms:
-51 + 9x = 21 + 5x

Solving
-51 + 9x = 21 + 5x

Solving for variable 'x'.

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

Add '-5x' to each side of the equation.
-51 + 9x + -5x = 21 + 5x + -5x

Combine like terms: 9x + -5x = 4x
-51 + 4x = 21 + 5x + -5x

Combine like terms: 5x + -5x = 0
-51 + 4x = 21 + 0
-51 + 4x = 21

Add '51' to each side of the equation.
-51 + 51 + 4x = 21 + 51

Combine like terms: -51 + 51 = 0
0 + 4x = 21 + 51
4x = 21 + 51

Combine like terms: 21 + 51 = 72
4x = 72

Divide each side by '4'.
x = 18

Simplifying
x = 18

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