f(-3)=8x+7

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Solution for f(-3)=8x+7 equation: 


Simplifying
f(-3) = 8x + 7

Reorder the terms for easier multiplication:
-3f = 8x + 7

Reorder the terms:
-3f = 7 + 8x

Solving
-3f = 7 + 8x

Solving for variable 'f'.

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

Divide each side by '-3'.
f = -2.333333333 + -2.666666667x

Simplifying
f = -2.333333333 + -2.666666667x

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