I ask my 11 year old son.
2b + 18 = 4b
Subtract 2b form each side: 18 = 2b
Divide each side by 2: 9 = b which is the same as b = 9, but you knew that, didn't you?
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The expression 18 plus 6 plus 4b simplifies to 24 + 4b.
5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21
2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1
4b + 3 = 15 First, Subtract 3 from both sides. -3 -3 4b = 12 Then, divide by 4 to get b by itself. 4 4 b = 3