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(1/3)*(10*x-2) = 7 // - 7
(1/3)*(10*x-2)-7 = 0
1/3*(10*x-2)-7 = 0
1/3*(10*x-2)-7 = 0
10/3*x-23/3 = 0
10/3*x-23/3 = 0
10/3*x-23/3 = 0 // + 23/3
10/3*x = 23/3 // : 10/3
x = 23/3/10/3
x = 23/10
x = 23/10
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