(4x-9)-(2x+7)=56
4x-9-2x-7=56
2x-16=56
2x=72
x=36
所以x=36。
(4x-9)-(2x+7)=56
解:去括号得,4x-9-2x-7=56
2x=56+9+7
2x=72
x=72÷2
x=36
(4x-9)-(2x+7)=56
4x一9一2X一7=56
2X一16=56
2X=56+16
2X=72
X=72÷2
X=36
(4x-9)-(2x+7)=56
4x-9-2x-7=56
2x-16=56
2x=56+16
2x=72
x=36
检验,4×36-9-2×36-7=56