69=10b-1

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Solution for 69=10b-1 equation:


Simplifying
69 = 10b + -1

Reorder the terms:
69 = -1 + 10b

Solving
69 = -1 + 10b

Solving for variable 'b'.

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

Add '-10b' to each side of the equation.
69 + -10b = -1 + 10b + -10b

Combine like terms: 10b + -10b = 0
69 + -10b = -1 + 0
69 + -10b = -1

Add '-69' to each side of the equation.
69 + -69 + -10b = -1 + -69

Combine like terms: 69 + -69 = 0
0 + -10b = -1 + -69
-10b = -1 + -69

Combine like terms: -1 + -69 = -70
-10b = -70

Divide each side by '-10'.
b = 7

Simplifying
b = 7

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