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x+1/7 = 29/7-3*x // - 29/7-3*x
x-(-3*x)+1/7-(29/7) = 0
x+3*x+1/7-29/7 = 0
4*x-4 = 0 // + 4
4*x = 4 // : 4
x = 4/4
x = 1
x = 1
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