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Simplifying
2(x + 1) + x(x + 1) + 2x2

Reorder the terms:
2(1 + x) + x(x + 1) + 2x2
(1 * 2 + x * 2) + x(x + 1) + 2x2
(2 + 2x) + x(x + 1) + 2x2

Reorder the terms:
2 + 2x + x(1 + x) + 2x2
2 + 2x + (1 * x + x * x) + 2x2
2 + 2x + (1x + x2) + 2x2

Combine like terms: 2x + 1x = 3x
2 + 3x + x2 + 2x2

Combine like terms: x2 + 2x2 = 3x2
2 + 3x + 3x2
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