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x in (-oo:+oo)
3-((2/7)*x)-((5/7)*x) = 14 // - 14
3-((2/7)*x)-((5/7)*x)-14 = 0
(-2/7)*x+(-5/7)*x-14+3 = 0
-x-11 = 0 // + 11
-x = 11 // * -1
x = -11
x = -11
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