So you need to figure out an unknown number,
Let this number be n. (Make n represent the unknown number while we figure it out)
This unknown number multiplied by 7, then added to 3 equals 59.
7n + 3 = 59
Remove 3 from both sides of the equation.
7n + 3 (- 3) = 59 (- 3)
7n = 59 - 3
7n = 56
Since the unknown number was also multiplied by 7, we need to divide both sides by 7
7n (/7) = 56 / 7
Imagine if n = 2 (it doesn't in this case) but if it did then 7 * 2 / 7 = 14 / 7 which equals 2.
So
7n / 7 = n
n = 56 / 7
I'll let you figure that part out.