10a+7b
undefined variables cannot be determined
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ok, let's see: (3a-2a) + (2b+5b) +(-c +3c) = a + 7b +2c I think that's right.
5b + 11 - 2b = 3b + 11
add like terms: 3a -2a -5b + 6b +3b - 7b = a -3b
5+3b? :3
It is: 7b+10 simplified