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(7/10)*(x-(2*y)-(5*z)) = 0
(7/10)*(x-2*y-5*z) = 0
7/10*(x-2*y-5*z) = 0
x-2*y-5*z = 0 // + -2*y-5*z
x = -(-2*y-5*z)
x = -(-2*y-5*z)
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