Question

How can I make this true 3×26+4 = 90

Answer 1

If you want this to equal 90 you could keep it like 3*26+4 then add 4+8=12 so your new equation would be 3*26+12=90

Answer 2

You could do 78+4 because 26x3 is 78 and then add the 12 and it will be 90