来自宋华明的问题
16*8-7X=239X-14*5.5=58
16*8-7X=239X-14*5.5=58
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16*8-7X=239X-14*5.5=58
16*8-7X=239X-14*5.5=58
16*8-7X=239X-14*5.5=58
128-7x=239x-77=58
128=23+7x9x=58+77
128-23=7x9x=135
105=7xx=15
7x=105
x=15