It is an equation in three unknown variables.
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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
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1
The expression 18 plus 6 plus 4b simplifies to 24 + 4b.