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(x -17) * 6 = x + 1383
6x - 102 = x + 1383
6x - x= 1383 + 102
5x = 1485
x= 1485 : 5
x= 297
spr.
(x -17) * 6 = x + 1383
L = ( x- 17) * 6= (297 - 17) * 6 = 280 * 6 =1680
P= x + 1383 = 297 + 1383 =1680
1680 = 1680
L=P
Odp. Tomek wybrał liczbę 297.