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(2x+20)^2=0
| -2x+21=6x-7 | | 9x-8=34x | | 3x-2.5=-3.7 | | 0.4÷a=5 | | 5(k+2)=2k+1 | | 1x+2=8x+9 | | 3/4e=9;e=12 | | 21=-x/6 | | X^2+28=10x | | 4x+1=1024 | | 3(b-25)+b=225 | | (3x+79)+(10x+50)=155 | | x+x+12=23 | | x2-9=8 | | 2x2-1=49 | | 12w−6−11w=9−2 | | x+1.2x=8910 | | 12.49+6x=19.63 | | x+5x=110 | | 6x+9=18x+81 | | ?/4x6=18 | | 5x+5−4x2−25=3x−5 | | 5.8c=4.4 | | -3x+18=11 | | 17.5x+21.8=51.8 | | 240-x=82 | | y=-1/2(-1)+3/2 | | 3x+128=8x+108 | | 269=139-u | | 5-4·(2x-3)=2x+7 | | 17x+4=105 | | -w+16=198 |