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2x+5x-3x=25+6
4x+31/:4
x=7,75
7x* + 5x - 6 = 25 + 3x |-3x
7x* + 2x - 6 = 25 | +6
7x* + 2x = 31
teraz tylko podzielisz i juz
*- jest to kwadrat
3x-6x+6x+6x-3x=25
6x=25/:6
x=6/25
powinny byc raczej kwadraty żle sorry