Answer:
2(5a+3b)+5a+2b
=10a+6b+5a+2b
=15a+8b
6y+2(3x+5)+2y+3
=6y+6x+10+2y+3
=8y+6x+13
8r+8r^2+6r^2+2r+r
=9r+14r^2
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