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