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 = -21a
-21 + -21a = 18 + 9a + -9a

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

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

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

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

Divide each side by '-21'.
a = -1.857142857

Simplifying
a = -1.857142857

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