(3*5)+(3*8)=3(a+7)

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Solution for (3*5)+(3*8)=3(a+7) equation: 


Simplifying
(3 * 5) + (3 * 8) = 3(a + 7)

Multiply 3 * 5
(15) + (3 * 8) = 3(a + 7)
15 + (3 * 8) = 3(a + 7)

Multiply 3 * 8
15 + (24) = 3(a + 7)
15 + 24 = 3(a + 7)

Combine like terms: 15 + 24 = 39
39 = 3(a + 7)

Reorder the terms:
39 = 3(7 + a)
39 = (7 * 3 + a * 3)
39 = (21 + 3a)

Solving
39 = 21 + 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.
39 + -3a = 21 + 3a + -3a

Combine like terms: 3a + -3a = 0
39 + -3a = 21 + 0
39 + -3a = 21

Add '-39' to each side of the equation.
39 + -39 + -3a = 21 + -39

Combine like terms: 39 + -39 = 0
0 + -3a = 21 + -39
-3a = 21 + -39

Combine like terms: 21 + -39 = -18
-3a = -18

Divide each side by '-3'.
a = 6

Simplifying
a = 6

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