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

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


Simplifying
-3(3 + -7a) + 3(3a + -9) = 0
(3 * -3 + -7a * -3) + 3(3a + -9) = 0
(-9 + 21a) + 3(3a + -9) = 0

Reorder the terms:
-9 + 21a + 3(-9 + 3a) = 0
-9 + 21a + (-9 * 3 + 3a * 3) = 0
-9 + 21a + (-27 + 9a) = 0

Reorder the terms:
-9 + -27 + 21a + 9a = 0

Combine like terms: -9 + -27 = -36
-36 + 21a + 9a = 0

Combine like terms: 21a + 9a = 30a
-36 + 30a = 0

Solving
-36 + 30a = 0

Solving for variable 'a'.

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

Add '36' to each side of the equation.
-36 + 36 + 30a = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 30a = 0 + 36
30a = 0 + 36

Combine like terms: 0 + 36 = 36
30a = 36

Divide each side by '30'.
a = 1.2

Simplifying
a = 1.2

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