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2*x+x/3 = (14*90)/9 // - (14*90)/9
2*x+x/3-((14*90)/9) = 0
2*x+x/3-140 = 0
7/3*x-140 = 0 // + 140
7/3*x = 140 // : 7/3
x = 140/7/3
x = 60
x = 60
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