12x-13=21

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Solution for 12x-13=21 equation: 


Simplifying
12x + -13 = 21

Reorder the terms:
-13 + 12x = 21

Solving
-13 + 12x = 21

Solving for variable 'x'.

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

Add '13' to each side of the equation.
-13 + 13 + 12x = 21 + 13

Combine like terms: -13 + 13 = 0
0 + 12x = 21 + 13
12x = 21 + 13

Combine like terms: 21 + 13 = 34
12x = 34

Divide each side by '12'.
x = 2.833333333

Simplifying
x = 2.833333333

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