3(a+7)+6a-3(a+2)=45

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Solution for 3(a+7)+6a-3(a+2)=45 equation:


Simplifying
3(a + 7) + 6a + -3(a + 2) = 45

Reorder the terms:
3(7 + a) + 6a + -3(a + 2) = 45
(7 * 3 + a * 3) + 6a + -3(a + 2) = 45
(21 + 3a) + 6a + -3(a + 2) = 45

Reorder the terms:
21 + 3a + 6a + -3(2 + a) = 45
21 + 3a + 6a + (2 * -3 + a * -3) = 45
21 + 3a + 6a + (-6 + -3a) = 45

Reorder the terms:
21 + -6 + 3a + 6a + -3a = 45

Combine like terms: 21 + -6 = 15
15 + 3a + 6a + -3a = 45

Combine like terms: 3a + 6a = 9a
15 + 9a + -3a = 45

Combine like terms: 9a + -3a = 6a
15 + 6a = 45

Solving
15 + 6a = 45

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + 6a = 45 + -15

Combine like terms: 15 + -15 = 0
0 + 6a = 45 + -15
6a = 45 + -15

Combine like terms: 45 + -15 = 30
6a = 30

Divide each side by '6'.
a = 5

Simplifying
a = 5

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