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1-3*x-(6*x) = 61/7 // - 61/7
1-3*x-(6*x)-(61/7) = 0
1-3*x-6*x-61/7 = 0
-9*x-54/7 = 0 // + 54/7
-9*x = 54/7 // : -9
x = 54/7/(-9)
x = -6/7
x = -6/7
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