3=10a+b

Solution for 3=10a+b equation:

Simplifying
3 = 10a + b

Solving
3 = 10a + b

Solving for variable 'a'.

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

Add '-10a' to each side of the equation.
3 + -10a = 10a + -10a + b

Combine like terms: 10a + -10a = 0
3 + -10a = 0 + b
3 + -10a = b

Add '-3' to each side of the equation.
3 + -3 + -10a = -3 + b

Combine like terms: 3 + -3 = 0
0 + -10a = -3 + b
-10a = -3 + b

Divide each side by '-10'.
a = 0.3 + -0.1b

Simplifying
a = 0.3 + -0.1b