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(7*(y-3))/3 = -4*t // + -4*t
(7*(y-3))/3-(-4*t) = 0
(7*(y-3))/3+4*t = 0
(7*(y-3))/3+(3*4*t)/3 = 0
7*(y-3)+3*4*t = 0
12*t+7*y-21 = 0
(12*t+7*y-21)/3 = 0
(12*t+7*y-21)/3 = 0 // * 3
12*t+7*y-21 = 0
x belongs to the empty set
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