.666(a-3)=10

Solution for .666(a-3)=10 equation:

Simplifying
0.666(a + -3) = 10

Reorder the terms:
0.666(-3 + a) = 10
(-3 * 0.666 + a * 0.666) = 10
(-1.998 + 0.666a) = 10

Solving
-1.998 + 0.666a = 10

Solving for variable 'a'.

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

Add '1.998' to each side of the equation.
-1.998 + 1.998 + 0.666a = 10 + 1.998

Combine like terms: -1.998 + 1.998 = 0.000
0.000 + 0.666a = 10 + 1.998
0.666a = 10 + 1.998

Combine like terms: 10 + 1.998 = 11.998
0.666a = 11.998

Divide each side by '0.666'.
a = 18.01501502

Simplifying
a = 18.01501502