7b + 16 = 5b + 24
7b - 5b = 24 - 16
2b = 8
b = 4
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The expression is 5b + 16
Add the equations: 4a + 4a - 5b + 5b = 7 + 17 ie 8a = 24 a = 3, so b = 1
b=7
3a+5b+7a=
The answer to 6b plus 7 times 5-4b plus 1 equals 38. This is taught in math.