15=b-(-63)

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Solution for 15=b-(-63) equation:


Simplifying
15 = b + -1(-63)

Multiply -1 * -63
15 = b + 63

Reorder the terms:
15 = 63 + b

Solving
15 = 63 + 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.
15 + -1b = 63 + b + -1b

Combine like terms: b + -1b = 0
15 + -1b = 63 + 0
15 + -1b = 63

Add '-15' to each side of the equation.
15 + -15 + -1b = 63 + -15

Combine like terms: 15 + -15 = 0
0 + -1b = 63 + -15
-1b = 63 + -15

Combine like terms: 63 + -15 = 48
-1b = 48

Divide each side by '-1'.
b = -48

Simplifying
b = -48

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