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(2*x)/3-(x/7)+2+3 = 5/21 // - 5/21
(2*x)/3-(x/7)-(5/21)+2+3 = 0
(2*x)/3-(x/7)-5/21+2+3 = 0
11/21*x+100/21 = 0 // - 100/21
11/21*x = -100/21 // : 11/21
x = -100/21/11/21
x = -100/11
x = -100/11
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