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Verified answer
1.2a+15=92a=9-15
2a=-6
a=-6/2
a=-3
Jadi -2a+8=-2(-3)+8=14
2.5c-3=3c+7
5c-3c=7+3
2c=10
C=10/2=5
Jadi 8c-17
8(5)-17=23