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=13x
b.) 5y-10y+13y
=8y
c.) 17a²+3a+11a
=17a²+14a
2.)a.)(2x+3)+(5+x)
=2x+3+5+x
=2x+x+3+5
=3x+8
b.)(x+2y-z)+(2x-y+3z)
=x+2y-z+2x-y+3z
=x+2x+2y-y-z+3z
=3x+y+2z
3.)a.)(10p-8)-(8p-10)
=10p-8-8p+10
=10p-8p-8+10
=2p+2
b.)(2-10m+5mn)-(3mn+5m)
=2-10m+5mn-3mn-5m
=2-10m-5m+5mn-3mn
=2-15m+2mn
Maaf,,buat soal yg blom dijwb