\[h+9=-3h-7\]
1
Add 3h3h to both sides.
h+9+3h=−7h+9+3h=-7

2
Simplify  h+9+3hh+9+3h  to  4h+94h+9.
4h+9=−74h+9=-7

3
Subtract 99 from both sides.
4h=−7−94h=-7-9

4
Simplify  −7−9-7-9  to  −16-16.
4h=−164h=-16

5
Divide both sides by 44.
h=−164h=-\frac{16}{4}

6
Simplify  164\frac{16}{4}  to  44.
h=−4h=-4

Done

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