2x2 + x2 = 3x2
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x2 + x2 = 2x2 2x^2
2x2 + 2x - 8 = 2(x2 + x - 4). This can take any value greater than or equal to -8.5
x+x=2x
2x2 + (5x-4x)2 + (x-x)2 = 2x2 + x2 + 02 = 2x2 + x2 = 3x2
x2 - 2x = x(x-2) and that cannot be simplified further.