100=.5*b*20

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Solution for 100=.5*b*20 equation:


Simplifying
100 = 0.5b * 20

Reorder the terms for easier multiplication:
100 = 0.5 * 20b

Multiply 0.5 * 20
100 = 10b

Solving
100 = 10b

Solving for variable 'b'.

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

Add '-10b' to each side of the equation.
100 + -10b = 10b + -10b

Combine like terms: 10b + -10b = 0
100 + -10b = 0

Add '-100' to each side of the equation.
100 + -100 + -10b = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -10b = 0 + -100
-10b = 0 + -100

Combine like terms: 0 + -100 = -100
-10b = -100

Divide each side by '-10'.
b = 10

Simplifying
b = 10

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