13=15+3b-13

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Solution for 13=15+3b-13 equation:


Simplifying
13 = 15 + 3b + -13

Reorder the terms:
13 = 15 + -13 + 3b

Combine like terms: 15 + -13 = 2
13 = 2 + 3b

Solving
13 = 2 + 3b

Solving for variable 'b'.

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

Add '-3b' to each side of the equation.
13 + -3b = 2 + 3b + -3b

Combine like terms: 3b + -3b = 0
13 + -3b = 2 + 0
13 + -3b = 2

Add '-13' to each side of the equation.
13 + -13 + -3b = 2 + -13

Combine like terms: 13 + -13 = 0
0 + -3b = 2 + -13
-3b = 2 + -13

Combine like terms: 2 + -13 = -11
-3b = -11

Divide each side by '-3'.
b = 3.666666667

Simplifying
b = 3.666666667

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