Question: CLARIFY THIS Plug a = 7 + b 2 c a=7+b2c and c = 3 b 5 c=3b5 into equation (3): 4 a + 3

CLARIFY THIS Plug a = 7 + b 2 c a=7+b2c and c = 3 b 5 c=3b5 into equation (3): 4 a + 3 b + 5 c = 15 4a+3b+5c=15 \[4(-7 + b - 2c) + 3b + 5c = -15 \ -28 + 4b - 8c + 3b + 5c = -15 \ -28 + 7b - 3c = -15 \ 7b - 3c = 13 \\] Substitute c = 3 b 5 c=3b5

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