OronD
OronD Answered:

John McCann gives always excellent answers but this time he made some mistake on the way: 
2(X-1.8) + 4.2(X+0.9) + 3.18
2X -3.6 + 4.2X + 3.78 + 3.18
6.2X + 3.36 

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John McCann
John McCann Thinks this answer is Helpful:

Yes, 2 and 4.2 do = 6.2 !!!!!!
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