20=13+f

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Solution for 20=13+f equation:


Simplifying
20 = 13 + f

Solving
20 = 13 + f

Solving for variable 'f'.

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

Add '-1f' to each side of the equation.
20 + -1f = 13 + f + -1f

Combine like terms: f + -1f = 0
20 + -1f = 13 + 0
20 + -1f = 13

Add '-20' to each side of the equation.
20 + -20 + -1f = 13 + -20

Combine like terms: 20 + -20 = 0
0 + -1f = 13 + -20
-1f = 13 + -20

Combine like terms: 13 + -20 = -7
-1f = -7

Divide each side by '-1'.
f = 7

Simplifying
f = 7

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