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7+4h+3-5h+h=0
We simplify the equation to the form, which is simple to understand
7+4h+3-5h+h=0
We move all terms containing h to the left and all other terms to the right.
+4h-5h+1h=0-7-3
We simplify left and right side of the equation.
h=-10
0=-10
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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