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Step-by-step explanation:
carry on learning
Answer:
what is the question
Step-by-step explanation:
Answer:
63rs
explanation:
collect like terms
12*2=24rs
21*2=42rs
then add 24+42=66rs
then subtract 3rs
then just add rs
9+6=15 and 15-12=3 so this =3 the -(-6) becomes positive