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12a+(-19a)=-7a
-23b+(-12b)=-11b
30-17=13
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Step-by-step explanation:
(1) (12a-23b+30) + (12b-17-19a)
= 12a-23b+30+12b-17-19a
= 12a-19a-23b+12b+30-17
= -7a-11b+13
(2) (12b+15+10a)-(21a+3b-13)
= 12b+15+10a-21a-3b+13
= 10a-21a+12b-3b+15+13
= -11a+9b+28
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