Solve 9-4xx+6=7for x.

jmc

algebra junior

Problem

Solve

\frac{9 - 4 x}{x + 6} = 7

for

x

Solution

Cross-multiplication gives

9 - 4 x = 7 x + 42.

Simplifying this expression tells us

- 11 x = 33

x = - 3 .

Final answer

-3