78=15+21b

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Solution for 78=15+21b equation:


Simplifying
78 = 15 + 21b

Solving
78 = 15 + 21b

Solving for variable 'b'.

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

Add '-21b' to each side of the equation.
78 + -21b = 15 + 21b + -21b

Combine like terms: 21b + -21b = 0
78 + -21b = 15 + 0
78 + -21b = 15

Add '-78' to each side of the equation.
78 + -78 + -21b = 15 + -78

Combine like terms: 78 + -78 = 0
0 + -21b = 15 + -78
-21b = 15 + -78

Combine like terms: 15 + -78 = -63
-21b = -63

Divide each side by '-21'.
b = 3

Simplifying
b = 3

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