Yes and they can be simplified to: b
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-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1
9a + 3b - 11a - 4b = -2a -b
It is an expression that can be simplified to: 1-4b-5c
there is a sign missing -- if 4b +15 = 7b then 3b = 15 and b thus = 5 if 4b - 15 = 7b then 3b = -15 and b = -5
3b - 7b - 2 = 26 then , -2 - 4b = 26 then , 4b = 26 then you do , -4 / 26 which equals 7