\(98-5\left(6+x\right)=28\\ =>5\left(6+x\right)=98-28=70\\ =>6+x=\dfrac{70}{5}=14\\ =>x=14-6=8\)
- 5(6 + x) = -70
-30 - 5x = -70
-5x = -40
x = 8
`98 - 5(6 + x) = 28`
`=> 5(6+x) = 98 - 28`
`=> 5(6+x) = 70`
`=> 6 + x = 70 : 5`
`=> 6 + x = 14`
`=> x = 14 -6 `
`=> x = 8`