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4*x+(1/2)*y+(1/4)*z = 20 // - 20
4*x+(1/2)*y+(1/4)*z-20 = 0
4*x+1/2*y+1/4*z-20 = 0 // - 1/2*y+1/4*z-20
4*x = -(1/2*y+1/4*z-20) // : 4
x = (-(1/2*y+1/4*z-20))/4
x = (20-(1/2*y)-(1/4*z))/4
x = (20-(1/2*y)-(1/4*z))/4
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