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It simplifies to: 3b+17
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a-b+a-b+2b+a = 4a
-2b + 7 -3b = 2 -2b +7 -3b +2b = 2 + 2b 7 -3b + 3b = 2 + 2b +3b 7-2 = 2-2 + 2b + 3b 5 = 5b 1 = b
b=7
10a - 10 b
4a + 3c - 2b - c + a - b = 5a - 3b + 2c