20b-13=87

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Solution for 20b-13=87 equation: 


Simplifying
20b + -13 = 87

Reorder the terms:
-13 + 20b = 87

Solving
-13 + 20b = 87

Solving for variable 'b'.

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

Add '13' to each side of the equation.
-13 + 13 + 20b = 87 + 13

Combine like terms: -13 + 13 = 0
0 + 20b = 87 + 13
20b = 87 + 13

Combine like terms: 87 + 13 = 100
20b = 100

Divide each side by '20'.
b = 5

Simplifying
b = 5

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