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which aspect is troubling you here?

all of it

no

e.g.:
(1+4-5) + (6-3) - (2+4-1) = 1+4-5 + 6-3 -2-4+1

does that make sense so far?

yes

good, so now try to use these rules to remove the braces in your expression

\[2x ^{4}y ^{3}+4x ^{3}y ^{4}-5x ^{4}y ^{3}+6x ^{3}y ^{4}\]

perfect!
now you just need to combine "like" terms

do you know what "like" terms are?

7x^14y^14

no - that is not quite right

fudge

no

is it one specific part here that is unclear or the whole thing?

the last explanation

that is where i am having the issue

yes

ok i think that make sense

yes

so i would come up with -3x^4y^3 +7x^3y^4

is t hat right

-3A+10B

correct - now just replace A and B by what they represent

ok that makes sense

got it right thanks asnaseer

ok - glad you got it now