720*x=(720+80)*(x-3)怎某解答这个方程
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720*x=(720+80)*(x-3)怎某解答这个方程
![720*x=(720+80)*(x-3)怎某解答这个方程](/uploads/image/z/19358362-10-2.jpg?t=720%2Ax%3D%28720%2B80%29%2A%28x-3%29%E6%80%8E%E6%9F%90%E8%A7%A3%E7%AD%94%E8%BF%99%E4%B8%AA%E6%96%B9%E7%A8%8B)
720x=800(x-3)
720x=800x-2400
720x-720x=800x-720x-2400
80x=2400
x=30
720x=800x-2400
720x-720x=800x-720x-2400
80x=2400
x=30