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OpenStudy (anonymous):
3r - (2r + 1) = 21
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OpenStudy (saifoo.khan):
Did you tried solving?
OpenStudy (anonymous):
Yes!
OpenStudy (saifoo.khan):
What did you got?
OpenStudy (australopithecus):
r + (-1)(2r + 1) = 21
OpenStudy (australopithecus):
distribute the -1 and solve
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OpenStudy (anonymous):
5r + 1 = 21?
OpenStudy (australopithecus):
no
OpenStudy (australopithecus):
(a)(b+c) = (a)(b) + (a)(c) where a, b and c are just numbers
OpenStudy (australopithecus):
apply the same rule with (-1)(2r + 1)
OpenStudy (australopithecus):
follow?
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