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2x5-644=0
2x*5=-644 /:5
2x=-128.8 / :2
x=64.4
b)
x3-x2+9x-9=0
x3-x2+9x=-9
10x=-9 /:10
x=-0.9
c)
x3-6x2+9x=0
6x-6x2=0
6x-12x=0
-6x=0 / -6
x=0
d)
x3+3x2-4x=0
-x=0