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