Correct: x+x=2x, x+y=x+y, x*x=x2, x*y=xy, x-3x=-2x, x*x3=x4, x2+x2=2x2, 2y+3y=5y, 0x=0, x0=1, y-x+2y=3y-x, a+a2=a+a2, a2+a*a=2a2, 3a2b+3a2b=6a2b, a2=a*a, x5:x3=x2, Incorrect: x+x=x2, x+y=xy, x*x=2x, x-2x=x, x*x4=5x, x2+x2=x4, 0x=x, y+y=y2, x0=0, 2x+2y=4xy, x6:x2=x3, x4*x2=x8, 3a+2b=5ab,

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