What is it that you want to "do" to it ?
Would you like to know what value for 'y' makes it true ?
Here's how you find that number:
4y + 1 = 13
Subtract 1 from each side:
4y = 12
Divide each side by 4:
y = 12/4 = 3
Whenever [ y = 3 ], then [ 4y plus 1 ] actually is 13.
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