If 3b = 39 then
b = 39/3
b = 13.
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If ( b ) equals 4, then ( 3b ) can be calculated by substituting 4 for ( b ). Thus, ( 3b = 3 \times 4 = 12 ). Therefore, ( 3b ) is equal to 12.
If a + b = 6, what is the value of 3a + 3b?
-3b=96+b -4b=96 b=-24
If you mean 3b+9 = 12 then b equals 1
a = 11 and b = 5.