1, 6x-5=3+4x
2, x-(17-x)=x-7
3, 9-25=(7-x)-(25+7)
4, 10-2.(4-3x)=-4
5, (-12^2)-x=56+10.13x
6, 2x^2-1=49
11, |x-5|=-5+8
12, |-9-x|-5=12
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Sinh Học lớp 12
