Х×(75:5)=60
Х×15=60
Х=60:15
Х=4
15×3:Х=9
45:Х=9
Х=45:9
Х=5
К+120:4=500
К+30=500
К=500-30
К=470
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Х×(75:5)=60
Х×15=60
Х=60:15
Х=4
15×3:Х=9
45:Х=9
Х=45:9
Х=5
К+120:4=500
К+30=500
К=500-30
К=470