2x-1*3=21

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Solution for 2x-1*3=21 equation: 


Simplifying
2x + -1 * 3 = 21

Multiply -1 * 3
2x + -3 = 21

Reorder the terms:
-3 + 2x = 21

Solving
-3 + 2x = 21

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 2x = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 2x = 21 + 3
2x = 21 + 3

Combine like terms: 21 + 3 = 24
2x = 24

Divide each side by '2'.
x = 12

Simplifying
x = 12

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