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6*x-x-((y/2)*y) = 0
6*x-x+(-1/2)*y^2 = 0
5*x-1/2*y^2 = 0 // + -1/2*y^2
5*x = -(-1/2*y^2) // : 5
x = (-(-1/2*y^2))/5
x = 1/10*y^2
x = 1/10*y^2
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