900=0.5*b*12

Solution for 900=0.5*b*12 equation:

Simplifying
900 = 0.5b * 12

Reorder the terms for easier multiplication:
900 = 0.5 * 12b

Multiply 0.5 * 12
900 = 6b

Solving
900 = 6b

Solving for variable 'b'.

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

Add '-6b' to each side of the equation.
900 + -6b = 6b + -6b

Combine like terms: 6b + -6b = 0
900 + -6b = 0

Add '-900' to each side of the equation.
900 + -900 + -6b = 0 + -900

Combine like terms: 900 + -900 = 0
0 + -6b = 0 + -900
-6b = 0 + -900

Combine like terms: 0 + -900 = -900
-6b = -900

Divide each side by '-6'.
b = 150

Simplifying
b = 150