4(f+1)=20

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Solution for 4(f+1)=20 equation: 


Simplifying
4(f + 1) = 20

Reorder the terms:
4(1 + f) = 20
(1 * 4 + f * 4) = 20
(4 + 4f) = 20

Solving
4 + 4f = 20

Solving for variable 'f'.

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

Add '-4' to each side of the equation.
4 + -4 + 4f = 20 + -4

Combine like terms: 4 + -4 = 0
0 + 4f = 20 + -4
4f = 20 + -4

Combine like terms: 20 + -4 = 16
4f = 16

Divide each side by '4'.
f = 4

Simplifying
f = 4

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