21=b+18

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Solution for 21=b+18 equation:


Simplifying
21 = b + 18

Reorder the terms:
21 = 18 + b

Solving
21 = 18 + 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.
21 + -1b = 18 + b + -1b

Combine like terms: b + -1b = 0
21 + -1b = 18 + 0
21 + -1b = 18

Add '-21' to each side of the equation.
21 + -21 + -1b = 18 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 18 + -21
-1b = 18 + -21

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

Divide each side by '-1'.
b = 3

Simplifying
b = 3

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