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0.04+640-0.02x=1120
Use the distributive property to multiply 0.02 by 32000-x.
640.04-0.02x=1120
Add 0.04 and 640 to get 640.04.
-0.02x=1120-640.04
Subtract 640.04 from both sides.
-0.02x=479.96
Subtract 640.04 from 1120 to get 479.96.
x=\frac{479.96}{-0.02}
Divide both sides by -0.02.
x=\frac{47996}{-2}
Expand \frac{479.96}{-0.02} by multiplying both numerator and the denominator by 100.
x=-23998
Divide 47996 by -2 to get -23998.