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2015-09-01T20:29:55+08:00

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First,combine like terms:
2x+ 10x+ (-x)

then,

2x+10x= 12x

lastly, solve the last term with the sum of the first term:
12x-x

Remember that x always have 1

12x-x= 11x

Therefore, 

2x+ (-x)+ 10x= 11x

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You're welcome ^^
can you help me to another one?
what is the methods in solving subtraction in monomials
Combine the numbers or terms with the same signs before you start answering the whole problem.
tnx