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-\left(8x-1\right)+45=-285
Multiply both sides of the equation by 3.
-8x-\left(-1\right)+45=-285
To find the opposite of 8x-1, find the opposite of each term.
-8x+1+45=-285
The opposite of -1 is 1.
-8x+46=-285
Add 1 and 45 to get 46.
-8x=-285-46
Subtract 46 from both sides.
-8x=-331
Subtract 46 from -285 to get -331.
x=\frac{-331}{-8}
Divide both sides by -8.
x=\frac{331}{8}
Fraction \frac{-331}{-8} can be simplified to \frac{331}{8} by removing the negative sign from both the numerator and the denominator.