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Simplify the algebraic expression
5xy - 3yz - 5xz + yz - 4xz + 7xy
you find the like terms:
5xy and +7xy - 3yz and +yz -5xz and - 4xz
there like terms if they have the same variables/exponents
THen you rewrite the problem with like terms next to eachother:
5xy + 7xy -3yz +yz -5xz - 4xz
Then you solve the like terms by themselfs:
5xy + 7 xy= 12 xy
-3yz +yz= -2yz
-5xz -4xz= -9xz
so the answer is 12xy -2yz-9xz and you can't simplify it any more because none of them are like terms