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(1*x)/2+(1*x)/6 = 7/1 // - 7/1
(1*x)/2+(1*x)/6-(7/1) = 0
x/2+x/6-7 = 0
2/3*x-7 = 0 // + 7
2/3*x = 7 // : 2/3
x = 7/2/3
x = 21/2
x = 21/2
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