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=6+6a-3-3a
=3+3a
2. (5*2a)+(5*b)+(-*2a)+(-*-3b)
=(10a+5b)-(-2a+3b)
=12a+2b
=6-3-6a+3a=3-3a
2. 5(2a-b)-(2a-3b)= 10a-5b-10a+15b
= 10a-10a-5b+15b=10b