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(-1/7)*(35*x-(21*y)) = 0
(-1/7)*(35*x-21*y) = 0
-1/7*(35*x-21*y) = 0
( -1/7 )
-1/7 = 0
x belongs to the empty set
( 35*x-21*y )
35*x-21*y = 0 // + -21*y
35*x = -(-21*y) // : 35
x = (-(-21*y))/35
x = (3*y)/5
x = (3*y)/5
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