21=0.5xb

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Solution for 21=0.5xb equation:


Simplifying
21 = 0.5xb

Solving
21 = 0.5bx

Solving for variable 'b'.

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

Add '-0.5bx' to each side of the equation.
21 + -0.5bx = 0.5bx + -0.5bx

Combine like terms: 0.5bx + -0.5bx = 0.0
21 + -0.5bx = 0.0

Add '-21' to each side of the equation.
21 + -21 + -0.5bx = 0.0 + -21

Combine like terms: 21 + -21 = 0
0 + -0.5bx = 0.0 + -21
-0.5bx = 0.0 + -21

Combine like terms: 0.0 + -21 = -21
-0.5bx = -21

Divide each side by '-0.5x'.
b = 42x-1

Simplifying
b = 42x-1

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