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2x*15x=7*45x
30x2=315x
2x*15x = 35x + 280x
30x² = 315x
x² = 10,5x
x² - 10,5x = 0
Δ = 441/4
√Δ = 21/2
x = 0 lub x = 10,5
2X*15X7*45X
30X2=315