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x in (-oo:+oo)
3*x = (5/7)*x-1 // - (5/7)*x-1
3*x-((5/7)*x)+1 = 0
3*x+(-5/7)*x+1 = 0
16/7*x+1 = 0 // - 1
16/7*x = -1 // : 16/7
x = -1/16/7
x = -7/16
x = -7/16
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