9-3(a-1)=4+a

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Solution for 9-3(a-1)=4+a equation: 


Simplifying
9 + -3(a + -1) = 4 + a

Reorder the terms:
9 + -3(-1 + a) = 4 + a
9 + (-1 * -3 + a * -3) = 4 + a
9 + (3 + -3a) = 4 + a

Combine like terms: 9 + 3 = 12
12 + -3a = 4 + a

Solving
12 + -3a = 4 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
12 + -3a + -1a = 4 + a + -1a

Combine like terms: -3a + -1a = -4a
12 + -4a = 4 + a + -1a

Combine like terms: a + -1a = 0
12 + -4a = 4 + 0
12 + -4a = 4

Add '-12' to each side of the equation.
12 + -12 + -4a = 4 + -12

Combine like terms: 12 + -12 = 0
0 + -4a = 4 + -12
-4a = 4 + -12

Combine like terms: 4 + -12 = -8
-4a = -8

Divide each side by '-4'.
a = 2

Simplifying
a = 2

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