21-6=B-21

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Solution for 21-6=B-21 equation:


Simplifying
21 + -6 = B + -21

Combine like terms: 21 + -6 = 15
15 = B + -21

Reorder the terms:
15 = -21 + B

Solving
15 = -21 + B

Solving for variable 'B'.

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

Add '-1B' to each side of the equation.
15 + -1B = -21 + B + -1B

Combine like terms: B + -1B = 0
15 + -1B = -21 + 0
15 + -1B = -21

Add '-15' to each side of the equation.
15 + -15 + -1B = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -1B = -21 + -15
-1B = -21 + -15

Combine like terms: -21 + -15 = -36
-1B = -36

Divide each side by '-1'.
B = 36

Simplifying
B = 36

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