Well maybe because the only thing that is different is the - and +
X should be 7 after doing all the calculation.
because in each case, the selected column composes one<span>-tenth of the grid in total. The number of blocks is different, but the proportion of space filled is the same.</span>
Your answer is y=15 for your problem
17 and 4 multiply to 68 and have a difference of 13
