9h+8-12=-40
9h-4= -40
Move -4 to the other side. Sign changes from -4 to +4.
9h-4+4= -40+4
9h= -36
Divide by 9
9h/9= -36/9
Cross out 9 and 9 , divide by 9. Becomes 1*1*h= h
h= -4
Answer : h= -4
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