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90=1/2*(6.5+5.5)*h
We simplify the equation to the form, which is simple to understand
90=1/2*(6.5+5.5)*h
Simplifying:
90=0.5*(6.5+5.5)*h
Simplifying terms in parentheses
90=0.5*(+12)*h
Reorder the terms in parentheses
90=+(+6)*h
Reorder the terms in parentheses
90=+(+6h)
Remove unnecessary parentheses
+90=+6h
We move all terms containing h to the left and all other terms to the right.
-6h=-90
We simplify left and right side of the equation.
-6h=-90
We divide both sides of the equation by -06 to get h.
h=15
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