\(\left(250-2x\right):6=85\\ 250-2x=85\times6\\ 250-2x=510\\ 2x=250-510\\ 2x=-260\\ x=-\dfrac{260}{2}\\ x=-130\)
`( 250 - 2x ) : 6 = 85`
`=> 250 - 2x = 85 xx 6`
`=> 250 - 2x = 510`
`=> 2x = 250 - 510`
`=> 2x = -260`
`=> x = -260 : 2`
`=> x = -130`
( 250 − 2 x ) : 6 = 85
250 − 2 x = 85 × 6
250 − 2 x = 510
2 x = 250 − 510
2 x = − 260
x = − 260/2
x = − 130