20b-8b-10b-1=9

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Solution for 20b-8b-10b-1=9 equation:


Simplifying
20b + -8b + -10b + -1 = 9

Reorder the terms:
-1 + 20b + -8b + -10b = 9

Combine like terms: 20b + -8b = 12b
-1 + 12b + -10b = 9

Combine like terms: 12b + -10b = 2b
-1 + 2b = 9

Solving
-1 + 2b = 9

Solving for variable 'b'.

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

Add '1' to each side of the equation.
-1 + 1 + 2b = 9 + 1

Combine like terms: -1 + 1 = 0
0 + 2b = 9 + 1
2b = 9 + 1

Combine like terms: 9 + 1 = 10
2b = 10

Divide each side by '2'.
b = 5

Simplifying
b = 5

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