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x=1/3,y= -1/2
3*1/3-2*(-1/2)-2=3/3+2/2-2=1+1-2=0
(6p - 4q +3r) - (-4r - 5q + 2p)=6p-4q+3r+4r+5q-2p=4p+q+7r
p = 0,25 , q = -√49, r = 1
4p+q+7r=4*0,25+(-√49)+7*1=1-7+7=1