2(0.3X+4)-5(0.2X-7)=9 方程解

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2(0.3X+4)-5(0.2X-7)=9方程解2(0.3X+4)-5(0.2X-7)=9方程解2(0.3X+4)-5(0.2X-7)=9方程解2(0.3X+4)-5(0.2X-7)=90.6x+8-

2(0.3X+4)-5(0.2X-7)=9 方程解
2(0.3X+4)-5(0.2X-7)=9 方程解

2(0.3X+4)-5(0.2X-7)=9 方程解
2(0.3X+4)-5(0.2X-7)=9
0.6x+8-x+35=9
0.4x=34
x=85

2(0.3X+4)-5(0.2X-7)=9
0.6X+8-X+35=9
-0.4X=9-8-35
0.4X=34
X=85

2(0.3X+4)-5(0.2X-7)=9
0.6X+8-X+35=9
-0.4X=9-8-35
-0.4X=-34
X=34/0.4
X=85

2(0.3X+4)-5(0.2X-7)=9
0.6X+8-X+35=9
8+35-9=X-0.6X
0.4X=34
X=34/0.4
X=85

2(0.3X+4)-5(0.2X-7)=9
0.6x+8-x+35=9
-0.4x=-34
x=85