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\frac{x}{-\frac{12+3}{4}}=-2.4
Multiply 3 and 4 to get 12.
\frac{x}{-\frac{15}{4}}=-2.4
Add 12 and 3 to get 15.
x=-2.4\left(-\frac{15}{4}\right)
Multiply both sides by -\frac{15}{4}.
x=-\frac{12}{5}\left(-\frac{15}{4}\right)
Convert decimal number -2.4 to fraction -\frac{24}{10}. Reduce the fraction -\frac{24}{10} to lowest terms by extracting and canceling out 2.
x=\frac{-12\left(-15\right)}{5\times 4}
Multiply -\frac{12}{5} times -\frac{15}{4} by multiplying numerator times numerator and denominator times denominator.
x=\frac{180}{20}
Do the multiplications in the fraction \frac{-12\left(-15\right)}{5\times 4}.
x=9
Divide 180 by 20 to get 9.