7(a+3)-3(a+2)=-9

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Solution for 7(a+3)-3(a+2)=-9 equation:


Simplifying
7(a + 3) + -3(a + 2) = -9

Reorder the terms:
7(3 + a) + -3(a + 2) = -9
(3 * 7 + a * 7) + -3(a + 2) = -9
(21 + 7a) + -3(a + 2) = -9

Reorder the terms:
21 + 7a + -3(2 + a) = -9
21 + 7a + (2 * -3 + a * -3) = -9
21 + 7a + (-6 + -3a) = -9

Reorder the terms:
21 + -6 + 7a + -3a = -9

Combine like terms: 21 + -6 = 15
15 + 7a + -3a = -9

Combine like terms: 7a + -3a = 4a
15 + 4a = -9

Solving
15 + 4a = -9

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 + 4a = -9 + -15

Combine like terms: 15 + -15 = 0
0 + 4a = -9 + -15
4a = -9 + -15

Combine like terms: -9 + -15 = -24
4a = -24

Divide each side by '4'.
a = -6

Simplifying
a = -6

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