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OpenStudy (anonymous):
a/4+a/3=21 what is a?
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OpenStudy (anonymous):
get lcd
OpenStudy (anonymous):
then add the fractions
OpenStudy (anonymous):
next, multiply both sides by lcd
OpenStudy (anonymous):
Lcd will be 12
OpenStudy (anonymous):
3a/12+4a/12=21 7a=21*12 a=3*12=36
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