f-18=-4(f-18)

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Solution for f-18=-4(f-18) equation: 



f-18=-4(f-18)

We move all terms to the left:

f-18-(-4(f-18))=0



We calculate terms in parentheses: -(-4(f-18)), so:

-4(f-18)

We multiply parentheses

-4f+72

Back to the equation:

-(-4f+72)



We get rid of parentheses

f+4f-72-18=0

We add all the numbers together, and all the variables

5f-90=0

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

5f=90

f=90/5

f=18

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