x-0.7x+4=13(解方程)

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x-0.7x+4=13(解方程)

x-0.7x+4=13(解方程)
x-0.7x+4=13(解方程)

x-0.7x+4=13(解方程)
x-0.7x+4=13
x-0.7x=13-4
0.3x=9
x=9/0.3
x=30

30

X=(13-4)/(1-0.7)=30

x-0.7x=13-4
0.3x=9
x=30

答案是:30

0.3x=9
x=30

x-0.7x=13-4
0.3x=9
x=9/0.3
x=30

x=30

0.3x+4=13
0.3x=9
x=30

x-0.7x+4=13
x-0.7x=13-4
0.3x=9
x=30

x-0.7x+4=13
1x-0.7x+4=13
0.3x+4=13
0.3x+4-4=13-4
0.3x=9
x=30

x-0.7x+4=13
4+1.7x=13
1.7x=13-4
1.7x=9
x=9除以1.7
x=5.29411764706