0
7r2 = 70r-175
Rearrange the equation and treat it as a quadratic equation:
7r2-70r+175 = 0
Divide all terms by 7:
r2-10+25 = 0
Solve by factoring or using the quadratic equation formula or by completing the square:
(r-5)(r-5)
x = 5 and x also = 5 (they both have equal roots)
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