参考・概略です
－2×(q/p)＝－p
●両辺をp倍して
－2q＝－p
――――――――――
①もし，pについて解くなら
●移項して
p＝2q
――――――――――
②もし，qについて解くなら
●両辺を「－2」で割り
q＝(1/2)p または，q＝p/2
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