First you need to add 4j and 9j 7(4j + 1 + 9j ) = 7(13j + 1) Then you have to multiply 7 by the parenthesis 7(13j + 1) = 91j + 7 You need now to transfer 7 to the other side of the equal and 7 become the opposite 91j + 7 91j = -7 now we have to isolate the j so you need to divide by 91 the two sides 91j = -7 j = -1/13
if you want to find the answer that gives an integer, replace j with the result found and make the equation 7(4j + 1 + 9j) 7[4(-1/13) + 1 + 9(-1/13)] 7(-4/13 + 1 -9/13) 7(0) = 0
