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(4/7)*x-(6*x)+8 = 75/7 // - 75/7
(4/7)*x-(6*x)-(75/7)+8 = 0
(4/7)*x-6*x-75/7+8 = 0
-38/7*x-19/7 = 0 // + 19/7
-38/7*x = 19/7 // : -38/7
x = 19/7/(-38/7)
x = -1/2
x = -1/2
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