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(3/7)*x+5*x+8 = -172/7 // + -172/7
(3/7)*x+5*x-(-172/7)+8 = 0
(3/7)*x+5*x+172/7+8 = 0
38/7*x+228/7 = 0 // - 228/7
38/7*x = -228/7 // : 38/7
x = -228/7/38/7
x = -6
x = -6
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