-3(1+h)=0.3(3-12h)

Solution for -3(1+h)=0.3(3-12h) equation:

-3(1+h)=0.3(3-12h)

We simplify the equation to the form, which is simple to understand 
-3(1+h)=0.3(3-12h)

Reorder the terms in parentheses
+(-3-3h)=0.3*(3-12h)

Remove unnecessary parentheses
-3-3h=0.3+*(+3-12h+)

Reorder the terms in parentheses
-3-3h=+( + 0.9-3.6h)

Remove unnecessary parentheses
-3-3h=0.9-3.6h

We move all terms containing h to the left and all other terms to the right. 
-3h+3.6h=0.9+3

We simplify left and right side of the equation. 
 + 0.6h=+3.9

We divide both sides of the equation by 0.6 to get h. 
h=6.5