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r in (-oo:+oo)
2*r-8 = (1/7)*(49*r-70) // - (1/7)*(49*r-70)
2*r-((1/7)*(49*r-70))-8 = 0
(-1/7)*(49*r-70)+2*r-8 = 0
2*r-1/7*(49*r-70)-8 = 0
2*r-1/7*(49*r-70)-8 = 0
10-5*r-8 = 0
2-5*r = 0
2-5*r = 0
2-5*r = 0 // - 2
-5*r = -2 // : -5
r = -2/(-5)
r = 2/5
r = 2/5
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