Solve for x
x=-17
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0.1x=-0.4-1.3
Subtract 1.3 from both sides.
0.1x=-1.7
Subtract 1.3 from -0.4 to get -1.7.
x=\frac{-1.7}{0.1}
Divide both sides by 0.1.
x=-17
Expand \frac{-1.7}{0.1} by multiplying both numerator and the denominator by 10. Anything divided by one gives itself.
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