Solve for x
x=3
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6300-900x=1200x
Use the distributive property to multiply 900 by 7-x.
6300-900x-1200x=0
Subtract 1200x from both sides.
6300-2100x=0
Combine -900x and -1200x to get -2100x.
-2100x=-6300
Subtract 6300 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-6300}{-2100}
Divide both sides by -2100.
x=3
Divide -6300 by -2100 to get 3.
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