.3(a-18)=.9a

Solution for .3(a-18)=.9a equation:

Simplifying
0.3(a + -18) = 0.9a

Reorder the terms:
0.3(-18 + a) = 0.9a
(-18 * 0.3 + a * 0.3) = 0.9a
(-5.4 + 0.3a) = 0.9a

Solving
-5.4 + 0.3a = 0.9a

Solving for variable 'a'.

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

Add '-0.9a' to each side of the equation.
-5.4 + 0.3a + -0.9a = 0.9a + -0.9a

Combine like terms: 0.3a + -0.9a = -0.6a
-5.4 + -0.6a = 0.9a + -0.9a

Combine like terms: 0.9a + -0.9a = 0.0
-5.4 + -0.6a = 0.0

Add '5.4' to each side of the equation.
-5.4 + 5.4 + -0.6a = 0.0 + 5.4

Combine like terms: -5.4 + 5.4 = 0.0
0.0 + -0.6a = 0.0 + 5.4
-0.6a = 0.0 + 5.4

Combine like terms: 0.0 + 5.4 = 5.4
-0.6a = 5.4

Divide each side by '-0.6'.
a = -9

Simplifying
a = -9