(25-2)+(25-1)+(30+2)+(35-1)+(40+2)+(45-2)=25+25+30+35+40+45-2-1+2-1+2-2=25+25+30+35+40+45-1-1=50+30+80+40-2=200-2=198
23+24+32+34+42+43=66+66+66=66*3=198
