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x-0.09x=728 need to see how to solve
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so x = 728/0.91 = 800 as (91x8=728)
\[x-0.09x = 728\]
you have on the left side two like variables so combine them
the first \[x = 1*x\]
so \[1-0.09 = 0.91\]
you then have \[0.91x = 728\]
then x = 728/0.91
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