方程x-5/9x=(330-x)-(330-x)*4/7求解快!

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方程x-5/9x=(330-x)-(330-x)*4/7求解快!
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方程x-5/9x=(330-x)-(330-x)*4/7求解快!
方程x-5/9x=(330-x)-(330-x)*4/7求解快!

方程x-5/9x=(330-x)-(330-x)*4/7求解快!
x-5/9x=(330-x)-(330-x)*4/7
4/9x=(330-x)*3/7
28x=330*27-27x
28x+27x=330*27
55x=8910
x=162

原方程=> 4x/9=3(330-x)/7 => 28x=27*330-27x => 55x=27*330 => x=162

x-5/9x=(330-x)-(330-x)*4/7
4/9x=(330-x)*3/7
x=63/5
=31.5