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(3/7)*x+7*x+7 = -575/7 // + -575/7
(3/7)*x+7*x-(-575/7)+7 = 0
(3/7)*x+7*x+575/7+7 = 0
52/7*x+624/7 = 0 // - 624/7
52/7*x = -624/7 // : 52/7
x = -624/7/52/7
x = -12
x = -12
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