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4x+6=x+30 | -6
4x=x+24 |-x
3x=24 | /3
x=8
proszę o naj ^^
8 x 4 = 32
32 + 6 = 38
30 + 8 = 38
x*4+6+x=30
4x+6=x+30 I-6
4x=x+24 I-x
3x=24 I:3
x=8
Sprawdzenie:
8*4+6=8+38
32+6=38
38=38
Ta liczba to 8