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3*x-(9/7) = 4 // - 4
3*x-(9/7)-4 = 0
3*x-9/7-4 = 0
3*x-37/7 = 0 // + 37/7
3*x = 37/7 // : 3
x = 37/7/3
x = 37/21
x = 37/21
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