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19*y = (20*z)/4-4*x // - (20*z)/4-4*x
19*y-(-4*x)-((20*z)/4) = 0
4*x+19*y-5*z = 0
4*x+19*y-5*z = 0 // - 19*y-5*z
4*x = -(19*y-5*z) // : 4
x = (-(19*y-5*z))/4
x = (-(19*y-5*z))/4
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