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(3*x)/7-(2*x)-1+7 = 1/3-(2*x)+2 // - 1/3-(2*x)+2
(3*x)/7-(2*x)+2*x-(1/3)-2-1+7 = 0
(3*x)/7-2*x+2*x-1/3-2-1+7 = 0
3/7*x+11/3 = 0 // - 11/3
3/7*x = -11/3 // : 3/7
x = -11/3/3/7
x = -77/9
x = -77/9
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