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2x+0+z=49.50+2.5y
2x+z=49.50+2.5y
2x+z+-1z=49.50+2.5y+-1z
+z=0-1z
2x+0=49.50+2.5y+-1.5
2x=49.50+2.5y+ -1z
divide cada lado '2'
x=24.75++1.25y-0.5z