-4-x+16-x=40x+x解:12-2x=41x41x+2x=1243x=12x=12/43
-4-x+16-x=40x+x12-2x=41x43x=12x=12/43
-4—X+16—X=40X+X8=40X+3X43X=8X=8/43
-4+16=40X+X+X+X12=43XX=12/43