\[3y+1=10\]

1
Subtract 11 from both sides.
3y=1013y=10-1

2
Simplify  10110-1  to  99.
3y=93y=9

3
Divide both sides by 33.
y=93y=\frac{9}{3}

4
Simplify  93\frac{9}{3}  to  33.
y=3y=3

Done

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