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4=\frac{9}{4}x+\frac{9}{4}\left(-4\right)+4
Use the distributive property to multiply \frac{9}{4} by x-4.
4=\frac{9}{4}x+\frac{9\left(-4\right)}{4}+4
Express \frac{9}{4}\left(-4\right) as a single fraction.
4=\frac{9}{4}x+\frac{-36}{4}+4
Multiply 9 and -4 to get -36.
4=\frac{9}{4}x-9+4
Divide -36 by 4 to get -9.
4=\frac{9}{4}x-5
Add -9 and 4 to get -5.
\frac{9}{4}x-5=4
Swap sides so that all variable terms are on the left hand side.
\frac{9}{4}x=4+5
Add 5 to both sides.
\frac{9}{4}x=9
Add 4 and 5 to get 9.
x=9\times \frac{4}{9}
Multiply both sides by \frac{4}{9}, the reciprocal of \frac{9}{4}.
x=4
Cancel out 9 and 9.