-(a-9)=2a+30

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Solution for -(a-9)=2a+30 equation:


Simplifying
-1(a + -9) = 2a + 30

Reorder the terms:
-1(-9 + a) = 2a + 30
(-9 * -1 + a * -1) = 2a + 30
(9 + -1a) = 2a + 30

Reorder the terms:
9 + -1a = 30 + 2a

Solving
9 + -1a = 30 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
9 + -1a + -2a = 30 + 2a + -2a

Combine like terms: -1a + -2a = -3a
9 + -3a = 30 + 2a + -2a

Combine like terms: 2a + -2a = 0
9 + -3a = 30 + 0
9 + -3a = 30

Add '-9' to each side of the equation.
9 + -9 + -3a = 30 + -9

Combine like terms: 9 + -9 = 0
0 + -3a = 30 + -9
-3a = 30 + -9

Combine like terms: 30 + -9 = 21
-3a = 21

Divide each side by '-3'.
a = -7

Simplifying
a = -7

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