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(30*x-(60*y)+90*z)/60 = 0
(30*x-60*y+90*z)/60 = 0
30*x-60*y+90*z = 0 // - 90*z-60*y
30*x = -(90*z-60*y) // : 30
x = (-(90*z-60*y))/30
x = (-(90*z-60*y))/30
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