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(1/5)*(35*x-20)-((1/6)*(54*x-(5*y))) = 0
(1/5)*(35*x-20)+(-1/6)*(54*x-5*y) = 0
1/5*(35*x-20)-1/6*(54*x-5*y) = 0
1/5*(35*x-20)-1/6*(54*x-5*y) = 0
5/6*y-2*x-4 = 0
5/6*y-2*x-4 = 0
5/6*y-2*x-4 = 0 // - 5/6*y-4
-2*x = -(5/6*y-4) // : -2
x = (-(5/6*y-4))/(-2)
x = (4-(5/6*y))/(-2)
x = (4-(5/6*y))/(-2)
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