2x+3(9-x)=20怎么解
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2x+3(9-x)=20怎么解
2x+3(9-x)=20怎么解
2x+3(9-x)=20怎么解
2X +27-3X=20
=> -X=20-27=-7 => X=7
2x+3(9-x)=20
2x+27-3x=20
2x-3x=20-27
-x=-7
x=7
2X+3(9-X)=20
2X+27-3X=20
X=27-20
X=7
2х+27-3х=20
3х-2х=27-20
х=7
2x+3*9-3*x=20
2x+27-3x=20
2x-3x=20-27
-x=-7
x=7
2X-27-3X=20
-X=7
X=-7
2x+3(9-x)=20
2x+27-3x=20
-x=20-27
-x=-7
x=7
2x+3(9-x)=20
2x+3*9-3x-20=0
-X+27-20=0
-x+7=0
x=7