100×0.14-0.13X=100-X,

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100×0.14-0.13X=100-X,100×0.14-0.13X=100-X,100×0.14-0.13X=100-X,14-0.13x=100-xx(1-0.13)=100-14x=86/0.

100×0.14-0.13X=100-X,
100×0.14-0.13X=100-X,

100×0.14-0.13X=100-X,
14-0.13x=100-x
x(1-0.13)=100-14
x=86/0.87
x=8600/87

100×0.14-0.13X=100-X
14-0.13x=100-x
x-0.13x=100-14
0.87x=86
x=8600/87

100×0.14-0.13X=100-X
14-0.13X=100-X
移项
X-0.13X=100-14
0.87X=86
X=86÷0.87=8600/87=98+74/87
X=98又87分之74