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x in (-oo:+oo)
(-1/6)*((6*x)/1-((42/1)*y)) = 0
(-1/6)*(6*x-42*y) = 0
-1/6*(6*x-42*y) = 0
( -1/6 )
-1/6 = 0
x belongs to the empty set
( 6*x-42*y )
6*x-42*y = 0 // + -42*y
6*x = -(-42*y) // : 6
x = (-(-42*y))/6
x = 7*y
x = 7*y
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