-15=21-(-6f)

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Solution for -15=21-(-6f) equation:


Simplifying
-15 = 21 + -1(-6f)

Remove parenthesis around (-6f)
-15 = 21 + -1 * -6f

Multiply -1 * -6
-15 = 21 + 6f

Solving
-15 = 21 + 6f

Solving for variable 'f'.

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

Add '-6f' to each side of the equation.
-15 + -6f = 21 + 6f + -6f

Combine like terms: 6f + -6f = 0
-15 + -6f = 21 + 0
-15 + -6f = 21

Add '15' to each side of the equation.
-15 + 15 + -6f = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -6f = 21 + 15
-6f = 21 + 15

Combine like terms: 21 + 15 = 36
-6f = 36

Divide each side by '-6'.
f = -6

Simplifying
f = -6

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