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81x+0.8x=-1.2
Add 0.8x to both sides.
81.8x=-1.2
Combine 81x and 0.8x to get 81.8x.
x=\frac{-1.2}{81.8}
Divide both sides by 81.8.
x=\frac{-12}{818}
Expand \frac{-1.2}{81.8} by multiplying both numerator and the denominator by 10.
x=-\frac{6}{409}
Reduce the fraction \frac{-12}{818} to lowest terms by extracting and canceling out 2.