b-(-20)=-15

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Solution for b-(-20)=-15 equation: 


Simplifying
b + -1(-20) = -15

Multiply -1 * -20
b + 20 = -15

Reorder the terms:
20 + b = -15

Solving
20 + b = -15

Solving for variable 'b'.

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

Add '-20' to each side of the equation.
20 + -20 + b = -15 + -20

Combine like terms: 20 + -20 = 0
0 + b = -15 + -20
b = -15 + -20

Combine like terms: -15 + -20 = -35
b = -35

Simplifying
b = -35

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