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(1/3)*(10*x-9) = 7 // - 7
(1/3)*(10*x-9)-7 = 0
1/3*(10*x-9)-7 = 0
1/3*(10*x-9)-7 = 0
10/3*x-10 = 0
10/3*x-10 = 0
10/3*x-10 = 0 // + 10
10/3*x = 10 // : 10/3
x = 10/10/3
x = 3
x = 3
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