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-40n(n+1=0
| 3200+300x=15,200 | | 3200+300x=15,2000 | | 18w=10 | | 5(7x+3)-35=225 | | 6z^2+3z=5 | | 33=-25+x | | (3-x)/2=1/5 | | 6x+13=2x+15 | | Y=x+4;(1.3) | | 0.5-2x=1.5 | | Y=6x;(2.12) | | X+6=7x-30 | | Y=2x+3;(3.9) | | x3+-10x2+25x+18=0 | | 22=5y+40 | | 8x-x-6x+3×=12 | | r^2+14r-49=0 | | -6x14=-44 | | 6x-6-5x+8=180 | | 9=2y-11 | | (x+2)^2+5=105 | | 8/x=6/30 | | 0.5x+14=-4 | | 21m^2-52m+32=0 | | -7-1=3(u-7) | | 3x-6=5.3 | | 8x-90=-50 | | 46=y/4+17 | | 3+p/3=2 | | 5x=70* | | 10n^2+19n-15=0 | | 2(w-5)=6w-42 |