21=q+3

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Solution for 21=q+3 equation:


Simplifying
21 = q + 3

Reorder the terms:
21 = 3 + q

Solving
21 = 3 + q

Solving for variable 'q'.

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

Add '-1q' to each side of the equation.
21 + -1q = 3 + q + -1q

Combine like terms: q + -1q = 0
21 + -1q = 3 + 0
21 + -1q = 3

Add '-21' to each side of the equation.
21 + -21 + -1q = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -1q = 3 + -21
-1q = 3 + -21

Combine like terms: 3 + -21 = -18
-1q = -18

Divide each side by '-1'.
q = 18

Simplifying
q = 18

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