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7*((1/35)*x-(3/7)) = 0
7*((1/35)*x-3/7) = 0
7*(1/35*x-3/7) = 0
( 1/35*x-3/7 )
1/35*x-3/7 = 0 // + 3/7
1/35*x = 3/7 // : 1/35
x = 3/7/1/35
x = 15
( 7 )
7 = 0
x belongs to the empty set
x = 15
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