105=5(8+b)

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Solution for 105=5(8+b) equation:


Simplifying
105 = 5(8 + b)
105 = (8 * 5 + b * 5)
105 = (40 + 5b)

Solving
105 = 40 + 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.
105 + -5b = 40 + 5b + -5b

Combine like terms: 5b + -5b = 0
105 + -5b = 40 + 0
105 + -5b = 40

Add '-105' to each side of the equation.
105 + -105 + -5b = 40 + -105

Combine like terms: 105 + -105 = 0
0 + -5b = 40 + -105
-5b = 40 + -105

Combine like terms: 40 + -105 = -65
-5b = -65

Divide each side by '-5'.
b = 13

Simplifying
b = 13

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