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-x/7-(6*x) = 19-(3*x) // - 19-(3*x)
3*x-x/7-(6*x)-19 = 0
3*x-x/7-6*x-19 = 0
-22/7*x-19 = 0 // + 19
-22/7*x = 19 // : -22/7
x = 19/(-22/7)
x = -133/22
x = -133/22
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