Add:2x+y+z,_x+2y+2z,x_y_z
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Step-by-step explanation:
2x+y+z+(-x+2y+2z)+(x-y-z)
2x+y+z-x+2y+2z+x-y-z
2x-x+x+y+2y-y+z+2z-z
2x+2y+2z
2(x+y+z)
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