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-\left(8x-1\right)+4.5=-28.5
Multiply both sides of the equation by 3.
-8x-\left(-1\right)+4.5=-28.5
To find the opposite of 8x-1, find the opposite of each term.
-8x+1+4.5=-28.5
The opposite of -1 is 1.
-8x+5.5=-28.5
Add 1 and 4.5 to get 5.5.
-8x=-28.5-5.5
Subtract 5.5 from both sides.
-8x=-34
Subtract 5.5 from -28.5 to get -34.
x=\frac{-34}{-8}
Divide both sides by -8.
x=\frac{17}{4}
Reduce the fraction \frac{-34}{-8} to lowest terms by extracting and canceling out -2.