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x²-x²+3x+4x=49
7x=49. /÷7
x=7
LICZE NA NAJ
x² + 3x - 49 = x² - 4x
x² - x² + 3x + 4x = 49
4x + 3x = 49
7x = 49 | :7
x = 7
Proszę :D