90/X+180=60/X-180

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90/X+180=60/X-18090/X+180=60/X-18090/X+180=60/X-18090/X+180=60/X-18090+180X=60-180X180X+180X=60-9036

90/X+180=60/X-180
90/X+180=60/X-180

90/X+180=60/X-180
90/X+180=60/X-180
90+180X=60-180X
180X+180X=60-90
360X=-30
X=-1/12

90+180x=60-180x
360x=-30
x=-1/12


90/X+180=60/X-180
两边都乘X得:90+180X=60-180X
移项得:180X+180X=60-90
合并同类项得:360X=-30
系数化为一得:X=-1/12

原式化简得60/x -90/x=360,两边同乘以x(x不等于0),得-30=360x, 解得 x=-1/12.