20-13=b

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Solution for 20-13=b equation:


Simplifying
20 + -13 = b

Combine like terms: 20 + -13 = 7
7 = b

Solving
7 = b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
7 + -1b = b + -1b

Combine like terms: b + -1b = 0
7 + -1b = 0

Add '-7' to each side of the equation.
7 + -7 + -1b = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1b = 0 + -7
-1b = 0 + -7

Combine like terms: 0 + -7 = -7
-1b = -7

Divide each side by '-1'.
b = 7

Simplifying
b = 7

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