12,5x - 20,5 = 24,5
12,5х=24,5+20,5
12,5х=45
Х=45:12,5
Х=3.6
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12,5x - 20,5 = 24,5
12,5х=24,5+20,5
12,5х=45
Х=45:12,5
Х=3.6