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Copy and simplify the following expressions by combining like terms. Using algebra tiles may be helpful.

$3+4x+2+2x+2x$
Hint (a):
Add like terms.
Answer (a):
$8x+5$

$8x+4-3-x$
Hint (b):
See part (a).

$7x^2+3x+4+7x^2+3x+4$
Hint (c):
See part (a).
Answer (c):
$14x^2+6x+8$

$5x+4+x+x^2+1$
Hint (d):
See part (a).

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