-1+21=b+18

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Solution for -1+21=b+18 equation:


Simplifying
-1 + 21 = b + 18

Combine like terms: -1 + 21 = 20
20 = b + 18

Reorder the terms:
20 = 18 + b

Solving
20 = 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.
20 + -1b = 18 + b + -1b

Combine like terms: b + -1b = 0
20 + -1b = 18 + 0
20 + -1b = 18

Add '-20' to each side of the equation.
20 + -20 + -1b = 18 + -20

Combine like terms: 20 + -20 = 0
0 + -1b = 18 + -20
-1b = 18 + -20

Combine like terms: 18 + -20 = -2
-1b = -2

Divide each side by '-1'.
b = 2

Simplifying
b = 2

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