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40x=\frac{40}{3}x+80\times \frac{2}{3}x-1200
Use the distributive property to multiply 80 by \frac{2}{3}x-15.
40x=\frac{40}{3}x+\frac{80\times 2}{3}x-1200
Express 80\times \frac{2}{3} as a single fraction.
40x=\frac{40}{3}x+\frac{160}{3}x-1200
Multiply 80 and 2 to get 160.
40x=\frac{200}{3}x-1200
Combine \frac{40}{3}x and \frac{160}{3}x to get \frac{200}{3}x.
40x-\frac{200}{3}x=-1200
Subtract \frac{200}{3}x from both sides.
-\frac{80}{3}x=-1200
Combine 40x and -\frac{200}{3}x to get -\frac{80}{3}x.
x=-1200\left(-\frac{3}{80}\right)
Multiply both sides by -\frac{3}{80}, the reciprocal of -\frac{80}{3}.
x=\frac{-1200\left(-3\right)}{80}
Express -1200\left(-\frac{3}{80}\right) as a single fraction.
x=\frac{3600}{80}
Multiply -1200 and -3 to get 3600.
x=45
Divide 3600 by 80 to get 45.