fractions are killing me, help

If it's this:

-4/(5x) = 16/15

You can cross-multiply:

-4 * 15 = 5x * 16

-60 = 80x

Divide by 80:

-60/80 = x

x = -3/4

If it's this:

(-4/5)x = 16/15

As stated above by Bill:

Multiply both sides by -5/4.

x = (16/15) (-5/4)

Cancel 16 and the 4.

x = (4/15)(-5/1)

Cancel the 15 and the -5

X = (4/3)(-1/1)

x = -4/3

Notice the answers are reciprocals depending on whether the x is in the numerator or the denominator.

Helpful suggestion:

Please make liberal use of parentheses when posting your questions.

Hope this helps.

Jason

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