X+930=X*4000/900 solve this
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X-40/9x=-930
9/9x-40/9x= -930
-31/40x=-930
-31x=- 930*40
X= 930*40/31
= 30*40
=1200
9/9x-40/9x= -930
-31/40x=-930
-31x=- 930*40
X= 930*40/31
= 30*40
=1200
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