7(3a+4)=31+9a

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Solution for 7(3a+4)=31+9a equation:


Simplifying
7(3a + 4) = 31 + 9a

Reorder the terms:
7(4 + 3a) = 31 + 9a
(4 * 7 + 3a * 7) = 31 + 9a
(28 + 21a) = 31 + 9a

Solving
28 + 21a = 31 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
28 + 21a + -9a = 31 + 9a + -9a

Combine like terms: 21a + -9a = 12a
28 + 12a = 31 + 9a + -9a

Combine like terms: 9a + -9a = 0
28 + 12a = 31 + 0
28 + 12a = 31

Add '-28' to each side of the equation.
28 + -28 + 12a = 31 + -28

Combine like terms: 28 + -28 = 0
0 + 12a = 31 + -28
12a = 31 + -28

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

Divide each side by '12'.
a = 0.25

Simplifying
a = 0.25

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