ohgeezy
10.09.2020 •
Mathematics
7(r+1)=5r+59
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Ответ:
7(r+1)=5r+59
7r+7=5r+59 /-5r (subtract 5r both sides)
7r-5r+7=5r-5r+59
2r+7=59 /-7 (subtract 7 both sides)
2r=59-7
2r=52 /:2 (divide both sides by 2)
r=26 - its the answer
Ответ:
Ответ:
50=100%
X=90%
X=50*90%/100
X=45