30-13b=8b-138

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Solution for 30-13b=8b-138 equation:


Simplifying
30 + -13b = 8b + -138

Reorder the terms:
30 + -13b = -138 + 8b

Solving
30 + -13b = -138 + 8b

Solving for variable 'b'.

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

Add '-8b' to each side of the equation.
30 + -13b + -8b = -138 + 8b + -8b

Combine like terms: -13b + -8b = -21b
30 + -21b = -138 + 8b + -8b

Combine like terms: 8b + -8b = 0
30 + -21b = -138 + 0
30 + -21b = -138

Add '-30' to each side of the equation.
30 + -30 + -21b = -138 + -30

Combine like terms: 30 + -30 = 0
0 + -21b = -138 + -30
-21b = -138 + -30

Combine like terms: -138 + -30 = -168
-21b = -168

Divide each side by '-21'.
b = 8

Simplifying
b = 8

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