3a-3(7+5a)=-9(2+a)

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Solution for 3a-3(7+5a)=-9(2+a) equation:


Simplifying
3a + -3(7 + 5a) = -9(2 + a)
3a + (7 * -3 + 5a * -3) = -9(2 + a)
3a + (-21 + -15a) = -9(2 + a)

Reorder the terms:
-21 + 3a + -15a = -9(2 + a)

Combine like terms: 3a + -15a = -12a
-21 + -12a = -9(2 + a)
-21 + -12a = (2 * -9 + a * -9)
-21 + -12a = (-18 + -9a)

Solving
-21 + -12a = -18 + -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.
-21 + -12a + 9a = -18 + -9a + 9a

Combine like terms: -12a + 9a = -3a
-21 + -3a = -18 + -9a + 9a

Combine like terms: -9a + 9a = 0
-21 + -3a = -18 + 0
-21 + -3a = -18

Add '21' to each side of the equation.
-21 + 21 + -3a = -18 + 21

Combine like terms: -21 + 21 = 0
0 + -3a = -18 + 21
-3a = -18 + 21

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

Divide each side by '-3'.
a = -1

Simplifying
a = -1

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