84=9+5b

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Solution for 84=9+5b equation:


Simplifying
84 = 9 + 5b

Solving
84 = 9 + 5b

Solving for variable 'b'.

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

Add '-5b' to each side of the equation.
84 + -5b = 9 + 5b + -5b

Combine like terms: 5b + -5b = 0
84 + -5b = 9 + 0
84 + -5b = 9

Add '-84' to each side of the equation.
84 + -84 + -5b = 9 + -84

Combine like terms: 84 + -84 = 0
0 + -5b = 9 + -84
-5b = 9 + -84

Combine like terms: 9 + -84 = -75
-5b = -75

Divide each side by '-5'.
b = 15

Simplifying
b = 15

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