1.
2x2=-18 /2
x2=-9
x=/9
x=-3
2.
3x2=-12/3
x2=-4
x=-/4
x=2
3.
5/6x2=1,2 /5/6
x2=6/5*6/5
x2=1
x=1
4.
4x2=81/4
x2=20,25
x=4.5
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1.
2x2=-18 /2
x2=-9
x=/9
x=-3
2.
3x2=-12/3
x2=-4
x=-/4
x=2
3.
5/6x2=1,2 /5/6
x2=6/5*6/5
x2=1
x=1
4.
4x2=81/4
x2=20,25
x=4.5