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9x-2.3x=8
Subtract 2.3x from both sides.
6.7x=8
Combine 9x and -2.3x to get 6.7x.
x=\frac{8}{6.7}
Divide both sides by 6.7.
x=\frac{80}{67}
Expand \frac{8}{6.7} by multiplying both numerator and the denominator by 10.