8f+-18=-90

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Solution for 8f+-18=-90 equation: 



8f+-18=-90

We move all terms to the left:

8f+-18-(-90)=0

We add all the numbers together, and all the variables

8f+72=0

We move all terms containing f to the left, all other terms to the right

8f=-72

f=-72/8

f=-9

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