100-x+130-x==120列方程,
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100-x+130-x==120
列方程,
-2x=120-100-130
-2x=-110
x=55
100-x+130-x=230-2x=120
2x=110,解得:x=55
100-x+130-x=120
x+x=100+130-200
2x=30
x=30/2
x=15
100-x+130-x==120
列方程,
-2x=120-100-130
-2x=-110
x=55
100-x+130-x=230-2x=120
2x=110,解得:x=55
100-x+130-x=120
x+x=100+130-200
2x=30
x=30/2
x=15