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(3*x)/y-(4*z) = 12 // - 12
(3*x)/y-(4*z)-12 = 0
(3*x)/y-4*z-12 = 0
3*x*y^-1-4*z-12 = 0 // + -4*z-12
3*x*y^-1 = -(-4*z-12) // : 3*y^-1
x = (-(-4*z-12))/(3*y^-1)
x = (12-(-4*z))/(3*y^-1)
x = (12-(-4*z))/(3*y^-1)
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