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((2/7)*x-2)*((1/3)*x-(1/30)) = 0
((2/7)*x-2)*((1/3)*x-1/30) = 0
(2/7*x-2)*(1/3*x-1/30) = 0
( 1/3*x-1/30 )
1/3*x-1/30 = 0 // + 1/30
1/3*x = 1/30 // : 1/3
x = 1/30/1/3
x = 1/10
( 2/7*x-2 )
2/7*x-2 = 0 // + 2
2/7*x = 2 // : 2/7
x = 2/2/7
x = 7
x in { 1/10, 7 }
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