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x-5x=-2
-4x= - 2 /: 2
x=2
b)(x-2)(x-5)=+4
x-2 * x-5 = +4
x+x= 2 + 5 + 4
2x=11 /: 2
x= =5
c)5 - 20x -45 = 0
20 x = -5 + 45 + 0
20x = 40 / : 20
x= 2
d)2x(x-1)(x-4)(+1)=0
3x - 2x + x - 4 + 1 = 0
2x = 4 - 1 + 0
2x = 3 / : 2
x =
e)-100x=0
x = - 100