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te kropki to mnożenie
5(3-2x)-(4x+6)*3=15-10x-(12x+18)=15-10x-12x-18=-3-22x
3(x2-2x+3)-2(x2-5x-1) dla x=2
3(2*2-2*2+3)-2(2*2-5*2-1)=3*3-(2*(-7))=9+14=23
a(2ab+b) - b (a-2ab +a2) dla a=0,1 i b= -10
0,1(2*0,1*(-10)) +10(0,1-2*0,1*(-10)+0,1*2)=0,1*(-2) + 10*2,3= -0,2 + 23=22,8