-8.15=3.5+b

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Solution for -8.15=3.5+b equation: 


Simplifying
-8.15 = 3.5 + b

Solving
-8.15 = 3.5 + 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.
-8.15 + -1b = 3.5 + b + -1b

Combine like terms: b + -1b = 0
-8.15 + -1b = 3.5 + 0
-8.15 + -1b = 3.5

Add '8.15' to each side of the equation.
-8.15 + 8.15 + -1b = 3.5 + 8.15

Combine like terms: -8.15 + 8.15 = 0.00
0.00 + -1b = 3.5 + 8.15
-1b = 3.5 + 8.15

Combine like terms: 3.5 + 8.15 = 11.65
-1b = 11.65

Divide each side by '-1'.
b = -11.65

Simplifying
b = -11.65

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