21+5x=8x+12

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Solution for 21+5x=8x+12 equation:


Simplifying
21 + 5x = 8x + 12

Reorder the terms:
21 + 5x = 12 + 8x

Solving
21 + 5x = 12 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
21 + 5x + -8x = 12 + 8x + -8x

Combine like terms: 5x + -8x = -3x
21 + -3x = 12 + 8x + -8x

Combine like terms: 8x + -8x = 0
21 + -3x = 12 + 0
21 + -3x = 12

Add '-21' to each side of the equation.
21 + -21 + -3x = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 12 + -21
-3x = 12 + -21

Combine like terms: 12 + -21 = -9
-3x = -9

Divide each side by '-3'.
x = 3

Simplifying
x = 3

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