4(5a+3)-9a=3(a-1)+31

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Solution for 4(5a+3)-9a=3(a-1)+31 equation:


Simplifying
4(5a + 3) + -9a = 3(a + -1) + 31

Reorder the terms:
4(3 + 5a) + -9a = 3(a + -1) + 31
(3 * 4 + 5a * 4) + -9a = 3(a + -1) + 31
(12 + 20a) + -9a = 3(a + -1) + 31

Combine like terms: 20a + -9a = 11a
12 + 11a = 3(a + -1) + 31

Reorder the terms:
12 + 11a = 3(-1 + a) + 31
12 + 11a = (-1 * 3 + a * 3) + 31
12 + 11a = (-3 + 3a) + 31

Reorder the terms:
12 + 11a = -3 + 31 + 3a

Combine like terms: -3 + 31 = 28
12 + 11a = 28 + 3a

Solving
12 + 11a = 28 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
12 + 11a + -3a = 28 + 3a + -3a

Combine like terms: 11a + -3a = 8a
12 + 8a = 28 + 3a + -3a

Combine like terms: 3a + -3a = 0
12 + 8a = 28 + 0
12 + 8a = 28

Add '-12' to each side of the equation.
12 + -12 + 8a = 28 + -12

Combine like terms: 12 + -12 = 0
0 + 8a = 28 + -12
8a = 28 + -12

Combine like terms: 28 + -12 = 16
8a = 16

Divide each side by '8'.
a = 2

Simplifying
a = 2

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