9(30+a)=90

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Solution for 9(30+a)=90 equation: 


Simplifying
9(30 + a) = 90
(30 * 9 + a * 9) = 90
(270 + 9a) = 90

Solving
270 + 9a = 90

Solving for variable 'a'.

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

Add '-270' to each side of the equation.
270 + -270 + 9a = 90 + -270

Combine like terms: 270 + -270 = 0
0 + 9a = 90 + -270
9a = 90 + -270

Combine like terms: 90 + -270 = -180
9a = -180

Divide each side by '9'.
a = -20

Simplifying
a = -20

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