$x+x+x+2$
$6+-7-\left(-8\right)+4-2$
$-9+4-3-5+10$
$-n+\left(-4\right)-\left(-4n\right)+6$
$5a-6b+8c+9a-20c-b+6b-c$
$5a+2b-3a+4$
Algebraic expressions can be simplified by combining like terms.
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