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It is an equation in three unknown variables.
5b = 21 + 4b 5b - 4b = 21 + 4b - 4b b = 21
a + b = 21 so a = 21 - b; 3a = 4b so 3(21 - b) = 4b ie 63 - 3b = 4b so 7b = 63 making b = 9 and a = 12
2a-6a-a=b+4b-4b -5a=5b-4b -5a=1b a=-5 b=1