20b-(84-b)=0

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Solution for 20b-(84-b)=0 equation:


Simplifying
20b + -1(84 + -1b) = 0
20b + (84 * -1 + -1b * -1) = 0
20b + (-84 + 1b) = 0

Reorder the terms:
-84 + 20b + 1b = 0

Combine like terms: 20b + 1b = 21b
-84 + 21b = 0

Solving
-84 + 21b = 0

Solving for variable 'b'.

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

Add '84' to each side of the equation.
-84 + 84 + 21b = 0 + 84

Combine like terms: -84 + 84 = 0
0 + 21b = 0 + 84
21b = 0 + 84

Combine like terms: 0 + 84 = 84
21b = 84

Divide each side by '21'.
b = 4

Simplifying
b = 4

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