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-0.15x=2.1-0.4
Subtract 0.4 from both sides.
-0.15x=1.7
Subtract 0.4 from 2.1 to get 1.7.
x=\frac{1.7}{-0.15}
Divide both sides by -0.15.
x=\frac{170}{-15}
Expand \frac{1.7}{-0.15} by multiplying both numerator and the denominator by 100.
x=-\frac{34}{3}
Reduce the fraction \frac{170}{-15} to lowest terms by extracting and canceling out 5.