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całość mnożymy razy 30
70x-480+36x+6=90x-465+15x
70x+36x-90x-15x=-465+480-6
x=11
Zadanie 5a.
½*(6³)^⅔+1-(3⁴)^¾*2¹ = ½*6²+1-3³*2 = ½*36+1-27*2 = 18+1-54 = -35