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(2*x)/7+3/14 = x/7-(1/14) // - x/7-(1/14)
(2*x)/7-(x/7)+3/14+1/14 = 0
1/7*x+2/7 = 0 // - 2/7
1/7*x = -2/7 // : 1/7
x = -2/7/1/7
x = -2
x = -2
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