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

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


Simplifying
a + 3a + -4(9 + -1a) = 0
a + 3a + (9 * -4 + -1a * -4) = 0
a + 3a + (-36 + 4a) = 0

Reorder the terms:
-36 + a + 3a + 4a = 0

Combine like terms: a + 3a = 4a
-36 + 4a + 4a = 0

Combine like terms: 4a + 4a = 8a
-36 + 8a = 0

Solving
-36 + 8a = 0

Solving for variable 'a'.

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

Add '36' to each side of the equation.
-36 + 36 + 8a = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 8a = 0 + 36
8a = 0 + 36

Combine like terms: 0 + 36 = 36
8a = 36

Divide each side by '8'.
a = 4.5

Simplifying
a = 4.5

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