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Verified answer
Bab AljabarMatematika SMP Kelas VII
a] a - 7 - (5 (-3a - 3)) = a - 7 - (-15a - 15)
= a - 7 + 15a + 15
= 16a + 8
b] 5a - 2c - 3b - (2b - 3a + 5c) = 5a - 2c - 3b - 2b + 3a - 5c
= 5a + 3a - 3b - 2b - 2c - 5c
= 8a - 5b - 7c