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całość mnożymy razy 30
70x-480+36x+6=90x-465+15x
70x+36x-90x-15x=-465+480-6
x=11
* 15-6= 9, a nie 11 ...
wszystko razy 30
10(7x-48)+6(6x+1)=90x-15(31-x)
70x-480+36+6=90x-465+15x
106x-90x-15x=-465+480-6
x=9