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(-3/7)*x-(5*x)-6 = -202/21 // + -202/21
(-3/7)*x-(5*x)-(-202/21)-6 = 0
(-3/7)*x-5*x+202/21-6 = 0
76/21-38/7*x = 0 // - 76/21
-38/7*x = -76/21 // : -38/7
x = -76/21/(-38/7)
x = 2/3
x = 2/3
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