((21.57+4.12+10.31)xx49)/(4.2)=?...

`((21.57+4.12+10.31)xx49)/(4.2)=?`

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0.007xx?xx0.07=0.0007xx0.7
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3840xx2(3)/(16)+?=1020xx5(5)/(12)xx(8)/(5)
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215xx165=?
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