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(1) 15/3x=15/x-2/3 両側に3x 15=45-2x 2x=30 x=15 (2) 72/20+X=48/20-X 両側に20倍 72+20x=48-20x 40x=24 x=3/5 (3) 1/2x=1/4 両側に4x x=2
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