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x in (-oo:+oo)
(5*y)/(-5)-2*x = 10*x-((6*z)/(-2)) // - 10*x-((6*z)/(-2))
(5*y)/(-5)-2*x-(10*x)+(6*z)/(-2) = 0
(5*y)/(-5)-2*x-10*x+(6*z)/(-2) = 0
-12*x-y-3*z = 0 // + -y-3*z
-12*x = -(-y-3*z) // : -12
x = (-(-y-3*z))/(-12)
x = (y-(-3*z))/(-12)
x = (y-(-3*z))/(-12)
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