4(f-3)=f+9

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Solution for 4(f-3)=f+9 equation:


Simplifying
4(f + -3) = f + 9

Reorder the terms:
4(-3 + f) = f + 9
(-3 * 4 + f * 4) = f + 9
(-12 + 4f) = f + 9

Reorder the terms:
-12 + 4f = 9 + f

Solving
-12 + 4f = 9 + 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.
-12 + 4f + -1f = 9 + f + -1f

Combine like terms: 4f + -1f = 3f
-12 + 3f = 9 + f + -1f

Combine like terms: f + -1f = 0
-12 + 3f = 9 + 0
-12 + 3f = 9

Add '12' to each side of the equation.
-12 + 12 + 3f = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 3f = 9 + 12
3f = 9 + 12

Combine like terms: 9 + 12 = 21
3f = 21

Divide each side by '3'.
f = 7

Simplifying
f = 7

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