=>[195-(3x-27)]=108
=>3x-27=195-108=87
=>3x=27+87=114
=>x=38
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`[195-(3x-27)].39=4212`
`=>195-(3x-27)=4212:39`
`=>195-(3x-27)=108`
`=>3x-27=195-108`
`=>3x-27=87`
`=>3x=87+27`
`=>3x=114`
`=>x=114:3`
`=>x=38`
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