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c)5(b-2a)+3(a-3b)-4(2a-4b)=
d)-7(2a+3b)-9(a-2b)-3(3a+4b)
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c)
5(b-2a)+3(a-3b)-4(2a-4b)=
5b-10a+3a-9b-8a+16b=
-15a+12b
d)
-7(2a+3b)-9(a-2b)-3(3a+4b)=
-14a-21b-9a+18b-9a-12b=
-32a-15b
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c)
5(b-2a)+3(a-3b)-4(2a-4b)=
5b-10a+3a-9b-8a+16b=
-15a+12b
d)
-7(2a+3b)-9(a-2b)-3(3a+4b)=
-14a-21b-9a+18b-9a-12b=
-32a-15b