Х-38=42 х+9=54 56-х=19 25+х=73
×-38=42 ×38+42 ×=80 ×80-38=42
X-38=42 x+9=54 56-x=19 25+x=73 x=42+38 x=54-9 x=56-19 x=73-25 x=80 x=45 x=37 x=48