5 х 3 х С = 450
15С = 450
С = 450 : 15
С =30
123 + Х + 95 = 400
Х = 400 - 95 - 123
Х = 182
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5 х 3 х С = 450
15С = 450
С = 450 : 15
С =30
123 + Х + 95 = 400
Х = 400 - 95 - 123
Х = 182