`1/2(x-6,2) -3,4(x+0,7) =0`
`->1/2(x-6,2) = 3,4(x+0,7)`
`-> 1/2x - 31/10 = 34/10x + 119/50`
`-> 1/2x - 34/10x = 119/50 +31/10`
`-> -29/10x = 137/25`
`-> x = -274/145`
Thử lại :
`1/2( -274/145) = -1173/290`
`3,4(-274/145) = -1173/290`
`-> 1/2( -274/145) -3,4(-274/145)`
` = -1173/290 - (-1173/290) = -1173/290+1173/290 = 0`