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całość mnożymy razy 30
70x-480+36x+6=90x-465+15x
70x+36x-90x-15x=-465+480-6
x=11
70x - 480 + 36x + 6 = 90x - 465 + 15x
70x + 36x - 90x - 15x = 480 - 6-465
x = 9