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3*x+(1/2)*y+((1/4)*z)/16 = 20 // - 20
3*x+(1/2)*y+((1/4)*z)/16-20 = 0
3*x+1/2*y+1/64*z-20 = 0 // - 1/2*y+1/64*z-20
3*x = -(1/2*y+1/64*z-20) // : 3
x = (-(1/2*y+1/64*z-20))/3
x = (20-(1/2*y)-(1/64*z))/3
x = (20-(1/2*y)-(1/64*z))/3
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