\(12000-(15000.2+1800.3+1800.2:3)\)
\(= 12000 - ( 30000 + 5400 + 1200 )\)
\(= 12000-36600\)
\(=-24600\)
`12000-(15000.2 + 1800.3 +1800.2:3)`
`=12000 -(30000 + 1800.3 +1800.2:3)`
`=12000-(30000 + 54000 + 1800 .2:3)`
`=12000-(30000 + 5400 +1200)`
`=12000 -36600`
`=-24600`