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(1/3)*(10*x-9) = 4 // - 4
(1/3)*(10*x-9)-4 = 0
1/3*(10*x-9)-4 = 0
1/3*(10*x-9)-4 = 0
10/3*x-7 = 0
10/3*x-7 = 0
10/3*x-7 = 0 // + 7
10/3*x = 7 // : 10/3
x = 7/10/3
x = 21/10
x = 21/10
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