12=-3x+21

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Solution for 12=-3x+21 equation:


Simplifying
12 = -3x + 21

Reorder the terms:
12 = 21 + -3x

Solving
12 = 21 + -3x

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '3'.
x = 3

Simplifying
x = 3

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