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4b - 3
It looks like a meaningless collection of letter and numbers. There is no mathematical operator between 4b and 3, there is no sign of equality of or inequality.
The GCF is 1.
7
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