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|dw:1364852403030:dw|
when denominator is common you can combine the numerator, \(\huge \dfrac{a}{b}+\dfrac{c}{b}=\dfrac{a+c}{b}\)
oh. But why is there a minus sign there. do i have to subtract?

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yes, whatever is in numerator, just copy it. |dw:1364852759481:dw| got that ^ ?
what? :/
do i have to subtract?
there was -15 in 1st numerator and -22 in 2nd so, i wrote -15-22 now to evaluate that, you can factor out - *minus* so, -15-22 = - (15+22) you had to add actually.
It's like if you have: |dw:1364852815238:dw| Because the denominators are the same, you can just rewrite it as one fraction: |dw:1364852863132:dw|
it was 16 not 15
oh, yes, just replace 15 by 16
-(16+22)
alrighty, thanks! :D that helps a lot
welcome ^_^
:D

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