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7*x-(3*x)-3 = -29/7 // + -29/7
7*x-(3*x)-(-29/7)-3 = 0
7*x-3*x+29/7-3 = 0
4*x+8/7 = 0 // - 8/7
4*x = -8/7 // : 4
x = -8/7/4
x = -2/7
x = -2/7
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