Если здесь икс только один, то
2*3*5*x = 27000
30x = 27000
x = 27000/30 = 900
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1) 248 + 58 = 306
2) 306 * 45 = 13770
3) 13765 * 7 = 96355
4) 96356 + 456 = 96811
5) 96811 - 13770 = 83041