b=a+(n-1)

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Solution for b=a+(n-1) equation: 


Simplifying
b = a + (n + -1)

Reorder the terms:
b = a + (-1 + n)

Remove parenthesis around (-1 + n)
b = a + -1 + n

Reorder the terms:
b = -1 + a + n

Solving
b = -1 + a + n

Solving for variable 'b'.

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

Simplifying
b = -1 + a + n

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