21.5=2.5+2(f-7.5)

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Solution for 21.5=2.5+2(f-7.5) equation:


Simplifying
21.5 = 2.5 + 2(f + -7.5)

Reorder the terms:
21.5 = 2.5 + 2(-7.5 + f)
21.5 = 2.5 + (-7.5 * 2 + f * 2)
21.5 = 2.5 + (-15 + 2f)

Combine like terms: 2.5 + -15 = -12.5
21.5 = -12.5 + 2f

Solving
21.5 = -12.5 + 2f

Solving for variable 'f'.

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

Add '-2f' to each side of the equation.
21.5 + -2f = -12.5 + 2f + -2f

Combine like terms: 2f + -2f = 0
21.5 + -2f = -12.5 + 0
21.5 + -2f = -12.5

Add '-21.5' to each side of the equation.
21.5 + -21.5 + -2f = -12.5 + -21.5

Combine like terms: 21.5 + -21.5 = 0.0
0.0 + -2f = -12.5 + -21.5
-2f = -12.5 + -21.5

Combine like terms: -12.5 + -21.5 = -34
-2f = -34

Divide each side by '-2'.
f = 17

Simplifying
f = 17

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