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= 13a + 21a - 8b + 9b
= 34a + b
2.) (42n + 35m + 7) - (-50m - 20n + 9)
= 42n - (-20n) + 35m - (-50m) + 7 - 9
= 62n + 85m - 2
3.) (6x + 4) - (x - y)
= 6x - x - (-y) + 4
= 5x - y + 4
4.) (5x" - 9xy - 4y") - (-x" - 6xy + 3y")
= 5x" - (-x") - 9xy - (-6xy) - 4y" - 3y"
= 6x" - 3xy - 7y"
Ket :
" = pangkat dua
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