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x in (-oo:+oo)
(1/3)*x-((3/4)*y) = (1/6)*z // - (1/6)*z
(1/3)*x-((3/4)*y)-((1/6)*z) = 0
(1/3)*x+(-3/4)*y+(-1/6)*z = 0
1/3*x-3/4*y-1/6*z = 0 // + -3/4*y-1/6*z
1/3*x = -(-3/4*y-1/6*z) // : 1/3
x = (-(-3/4*y-1/6*z))/1/3
x = -3*(-3/4*y-1/6*z)
x = -3*(-3/4*y-1/6*z)
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