自信がないんですが
40(3-2X)-25=20(X-3)
120-80X-25=20X-60
120-25+60=80X+20X
155=100X
1.55=X
だと思います～
間違ってたらゴメンなさい！
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追加でいちばん始めに両辺を100倍します