Simplify 2x+5x

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is this incorrect?? im think its correct, maybe. if x =4 then 2x4x5x4=28, if you just add 2 and 5 it becomes 7x4=28, same answer... but why is everyone saying its wrong? i do not understand help me i'm doing math homework last minute

carnngi
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Wouldn't it be 7x squared because there is 2 x's

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