`-(-x+13-142) +18=55`
`=> x - 13 +142=55-18`
`=> x - 13 +142=37`
`=> x-13=37-142`
`=>x-13=-105`
`=>x=-105+13`
`=>x=-92`
- (- \(x\) + 13 - 142 ) + 18 = 55
\(x\) - 13 + 142 + 18 = 55
\(x\) = 55 - 18 - 142 + 13
\(x\) = (55 + 13) - (18 + 142)
\(x\) = 68 - 160
\(x\) = - 92