3f-12=-f-15

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Solution for 3f-12=-f-15 equation:


Simplifying
3f + -12 = -1f + -15

Reorder the terms:
-12 + 3f = -1f + -15

Reorder the terms:
-12 + 3f = -15 + -1f

Solving
-12 + 3f = -15 + -1f

Solving for variable 'f'.

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

Add 'f' to each side of the equation.
-12 + 3f + f = -15 + -1f + f

Combine like terms: 3f + f = 4f
-12 + 4f = -15 + -1f + f

Combine like terms: -1f + f = 0
-12 + 4f = -15 + 0
-12 + 4f = -15

Add '12' to each side of the equation.
-12 + 12 + 4f = -15 + 12

Combine like terms: -12 + 12 = 0
0 + 4f = -15 + 12
4f = -15 + 12

Combine like terms: -15 + 12 = -3
4f = -3

Divide each side by '4'.
f = -0.75

Simplifying
f = -0.75

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