This is the equation in numbers translated (n is a number)
26 + 2n = 312
We have to find what the number (n) is. This means we must isolate n. To do this you must subtract 26 to both sides
26 - 26 + 2n = 312 - 26
0 + 2n = 286
2n = 286
To further isolate n you must divide 2 to both sides
2n/2 =286/2
n = 143
Check:
26 + 143*2 = 312
26 + 286 = 312
312 = 312
The number is 143
Hope this helped!
~Just a girl in love with Shawn Mendes