9(a+1)=90

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Solution for 9(a+1)=90 equation: 


Simplifying
9(a + 1) = 90

Reorder the terms:
9(1 + a) = 90
(1 * 9 + a * 9) = 90
(9 + 9a) = 90

Solving
9 + 9a = 90

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + 9a = 90 + -9

Combine like terms: 9 + -9 = 0
0 + 9a = 90 + -9
9a = 90 + -9

Combine like terms: 90 + -9 = 81
9a = 81

Divide each side by '9'.
a = 9

Simplifying
a = 9

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