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(1/6)*(30*x-42) = 7 // - 7
(1/6)*(30*x-42)-7 = 0
1/6*(30*x-42)-7 = 0
1/6*(30*x-42)-7 = 0
5*x-14 = 0
5*x-14 = 0
5*x-14 = 0 // + 14
5*x = 14 // : 5
x = 14/5
x = 14/5
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